Question 1 :
the number of electric field lines emerged out of 1 C charge is
Question 4 :
Two charges $q_1$ and $q_2$, are separated by a distance r and apply a force F to each other. If both charges are doubled and the distance between them is also doubled, find out the new force between them ? <br/>
Question 5 :
Electric field due to a point charge $q$ at distance $r$ has magnitude :<br/>
Question 7 :
What will bethe effect on the divergence of the leaves of aunchargedgold leaf electroscope onbringing a negatively charged rod near electroscope?
Question 9 :
In a gold leaf electroscope, its stem is made up of:
Question 11 :
Electric charge is due to the loss or gain of .............
Question 14 :
A point charge $+q$ is placed at the centre of a cube of side L. The electric flux emerging from the cube is
Question 17 :
Two point charges with charges  $3$ micro coulombs and $4$ micro coulombs are separated by $2$ cm.The value of the force between them?
Question 18 :
If the electric flux entering and leaving a closed surface are respectively of magnitude $\phi_{1}$ and $\phi_{2}$ then the electric charge inside the surface will be
Question 21 :
The materials that do not allow flow of electron through them are known as :
Question 23 :
If electrical force between two charges is $200 N$ and we increase $10$% charge on one of the charges and decrease $10$% charge on the other, then electrical force between them for the same distance becomes :<br>
Question 24 : <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"><p class="wysiwyg-text-align-left">The angle between the electric dipole moment and the electric field strength due to it, on the equatorial line is :</p>
Question 25 :
If the electric force between two unknown charges is attractive, identify which of the following statement must be true?<br/>
Question 27 :
State whether true or false.<br/>Metals as compared to non-metals are generally bad conductors of electricity.<br/>
Question 28 :
An electron (of charge $-e$) revolves around a long wire with uniform charge density $\lambda$ in a circular path of radius $r$. Its kinetic energy is given by:
Question 29 :
Assertion: A charge $q$ is placed on a height $h / 4$ above the centre of a square of side $b$. The flux associated with the square is independent of side length.
Reason: Gauss's law is independent of size of the Gaussian surface.
Question 32 :
A small sphere of mass $m$ and electric charge $q$, is suspended by a light thread. A second sphere carrying a charge $q_2$ is placed directly below the first sphere at a distance $'d' $ away. Then :
Question 35 :
Two point charges $q$ and $-2q$ are placed some distance $d$ apart. If the electric field at the location of $q$ due to $-2q$ is $E$, than at the location of $-2q$ due to $q$ is ( No external Field is present )
Question 36 :
Find out on which of following factors does strength of the force between charged particles depend.<br/>
Question 37 :
When a glass rod is rubbed with silk cloth, it acquires positive charge because:
Question 39 : <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"><p class="wysiwyg-text-align-left">Fill in the blank.</p><p class="wysiwyg-text-align-left">$1$ Coulomb of charge contains_______number of electrons.</p>
Question 41 :
What is the ratio of electric field intensity at distance $5$ cm to that at $10$ cm from a point charge $Q$ in air?<br/>
Question 42 :
A charged body is brought near an uncharged gold leaf electroscope. What will be your observation if the body is charged?
Question 43 :
 If E=0, at all points of a closed surface. The total charge enclosed by the surface is zero.
Question 44 :
A charge of $0.8$ coulomb is divided into two charges ${Q}_{1}$ and ${Q}_{2}$. These are kept at a separation of $30cm$. The force on ${Q}_{1}$ is maximum when :
Question 46 :
Calculate the excess number of electrons on each of two similar charged spheres that are located 5 cm apart (in air),such that the force of repulsion between them is 36 x 10$^{-19}$N
Question 48 :
Electric charges having same magnitude of electriccharge 'q', coulombs are placed at x=1m, 2m, 3m, 4m, 8m, ....... and so on.If any two consecutive charges haveopposite sign but the first charge is necessarily positive,what will be the potential at x = O?
Question 49 :
$\begin{array} { l } { \text { Four equal charges } Q \text { are placed at the four corners of a square of side a each. Work done i } } \\ { \text { removing a charge } - Q \text { from its centre to infinity is: } } \end{array}$
Question 50 :
Two identical charged spheres suspended from a common distance $d(d < < 1)$ apart because of their mutual repulsion. The charged begin to leak from both the spheres at a constant rate. As a result, the spheres approach each other with a velocity $v$. Then $v$ varies as a function of the distance $x$ between the spheres, as
Question 51 :
Sparking occurs when a load is switched off because the circuit has high :<br/>
Question 52 :
Which of the following instruments is used for detecting electric charge?
Question 53 :
Which of the following is not a property of electric lines of force?
Question 54 :
There is a solid sphere of radius $R$ having uniformly distributed charge throughout it. What is the relation between electric field $E$ and distance $r$ from the centre $(r< R)$?
Question 56 :
Consider a thin spherical shell of radius $R$ consisting of uniform surface charge density $\sigma$. The electric field at a point of distance $x$ from its centre and outside the shell is
Question 57 :
An infinite parallel plane sheet of a metal is charged to charge density $\sigma$ coulomb per square metre in a medium of dielectric constant $K$. Intensity of electric field near the metallic surface will be :
Question 58 :
Two bodies have equal charge $q$, where each is charged with two electrons. One electron is transferred from the first body to the second so that one body has one excess electrons and other has three excess electrons while maintaining the distance between the charges. Which of the following statements are correct?I.The amount of electrostatic charge has decreased<br/>II.The electrostatic force between the pith balls has decreased<br/>III.Both the electrostatic charge and force have decreased
Question 59 :
Assertion: The flux of electric field through a spherical surface of radius 1.5 a is more than flux of electric field through a spherical surface of radius 0.5 a. (Both centred at origin)
Reason: The electric field at x = 1.5 a is more than electric field at 0.5 a
Question 60 :
If the flux of the electric field through a closed surface is zero, then :
Question 61 :
A charge q is placed at corner of a closed cube the flux related with any face of cube.
Question 62 :
A small plastic ball of mass m covered with a thin zinc coating, is suspended by means of an insulating thread from a fixed point. There exists an electric field of magnitude E directed along horizontal. Now ultraviolet light is made to incident on the ball due to which it acquires a positive charge. Acceleration due to gravity is g.<br/>(a) What is the origin of positive charge acquired by the ball ?<br/>
Question 63 :
Find the electric field inside the shell at a distance $r$ from the centre.
Question 64 :
An electric charge produces an electric intensity of $500 N/C$ at a point in air. If the air is replaced by a medium of dielectric constant $2.5$, then the intensity of the electric field due to the same charge at the same point will be:
Question 66 :
The total number of lines of force passing through a surface is called
Question 67 :
A radio active nucleus (initial mass number A and atomic number Z emits 4$\alpha$- particles and 3 positrons).The ratio of numbers of neutrons to that of protons in the final nucleus will be
Question 68 :
Assertion: Gauss theorem can be applied only for a closed surface.
Reason: Electric flux can be obtained passing from an open surface also.
Question 69 :
How does the electric field(E) between the plates of a charged cylindrical capacitor vary with the distance r from the axis of the cylinder?
Question 70 :
A charge of $80 \mu C$ is uniformly distributed along the x-axis from x=0 to x=2.0 m. Determine the magnitude of the electric field at a point on the x-axis with x=8.0 m.
Question 71 : <p class="wysiwyg-text-align-left"><span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">A charge of $10^{-10}C$ <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">is palced at the origin. The eletric field(in N/C) at $(1,1)$ cm due to it, is:</p>
Question 72 :
The resolving power of an electron microscope is much higher than that of an ordinary light microscope because resolving power increases.
Question 73 :
Three charges, each of value $Q$, are placed at the vertices of an equilateral triangle. A fourth $q$ is placed at the centre of the triangle. if the charges remains stationary, then $q$ is
Question 74 :
<b></b>If two electrons are separated by a distance of $0.5\mathring { A }$, then the ratio of coulomb force and weight of the electron is approximately :
Question 75 : <p><span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">Three charges each equal to $10^{-9}C$<i> </i><span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">are placed<span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"> at the corners of equilateral triangle of side $1\ m$.<span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"> The force on one of the charges is:</p>
Question 76 :
A particle of mass m and charge -q moves diametrically through a uniformly charged sphere of radius R with total charge Q. The angular frequency of the particle's simple harmonic motion, if its amplitude < R, is given by :
Question 77 :
The flux of $\overrightarrow{g}$ through this surface is given by :
Question 78 :
A point charge $q$ is placed at a point on the axis of a non-conducting circular plate of radius $r$ at a distance $R (R >> r)$ from its center. The electric flux associated with the plate is :<br/>
Question 79 :
The electric field at a point $2$cm from an infinite line charge of linear charge density $10^{-7}$ $cm^{-1}$ is?
Question 80 :
Charges $Q_1$ and $Q_2$ lie inside and outside respectively of a closed surface S. Let E be the field at any point on S and $\phi$ be the flux of E over S.
Question 81 :
The electric field in a region is $E = \displaystyle \frac{5\times 10^3 x}{2}\hat{i} \ NC^{-1} cm^{-1} $. The charge contained inside a cubical volume bounded by the surfaces $x = 0, x = 1, y = 0, y = 1, z = 0, z = 1$ is (where x, y, z are in cm) :
Question 82 :
The flux of the electric field due to charges distributed in a sphere of radius $5$ cm is $10$ Vm. What will be the electric flux, through a concentric sphere of radius $10$ cm ?
Question 83 :
The total electric flux through a closed surface is equal to
Question 84 :
If the charge $+Q$ is now at the centre of a cube of side $2l$, what is the total flux emerging from all the six faces of the closedsurface?
Question 85 :
Two charged spheres having radii a and b are joined with a wire then the ratio of electric field $\dfrac{E_a}{E_b}$ on their surface is?
Question 86 :
An electric charge $q$is placed at the centre of a cube of side $a$ The electric flux throughone of its faces is
Question 87 :
A solid ball of radius $R$ has a charge density $\rho$ given by $\rho={\rho}_{o}1-/R$ for $0\le r\le$.the electric field outside the ball is
Question 88 :
Find the electric field at a distance $x$ from the centreinside the shell.
Question 89 :
A system consists of a thin charged wire ring of radius r and a very long uniformly charged wire oriented along the axis of the ring, with one of its ends coinciding with the center of the ring. The total charge on the ring is q, and the linear charge density on the straight wire is $\lambda$. The interaction force between the ring and the wire is :
Question 90 :
In a region, the intensity of an electric field is given by $E = 2i + 3j + k$ in $NC^{-1}$. The electric flux through a surface $S = 10i \ m^{2}$ in the region is:
Question 91 :
A semi-circular rod of radius $R$ is charged uniformly with a total charge $Q\ C$. The electric field intensity at the centre of the curvature is<br/>(where $K= \dfrac{1}{4 \pi \epsilon_0}$)<br/>
Question 92 :
A sphere of radius R carries charge such that its volume charge density is proportional to the square of the distance from the center. What is the ratio of the magnitude of the electric field at distance 2R from the center to the magnitude of the electric field at a distance of R/2 from the center?
Question 93 :
Two thin rods of length L lie along x-axis, one between $\displaystyle x = \frac{a}{2}  \ \ \   to   \ \ \ \ \ x = \frac{a}{2} + L$ and the other between $x = \displaystyle -\frac{a}{2}  to  \ \ \ \ \ x = - \frac{a}{2} - L$.<br/>Each rod has positive charge Q distributed uniformly along the length. Find the magnitude of the force which one rod exerts on the other.
Question 94 :
A solid sphere of radius $R$ has a charge $Q$ distributed in its volume with a charge density $\rho = kr^{a}$, where $k$ and $a$ are constants and $r$ is the distance from its centre. If the electric field at $r = \dfrac {R}{2}$ is $\dfrac {1}{8}$ times that at $r = R$, the value of $a$ is
Question 95 :
The expression for electric field intensity at a point outside uniformly charged thin place sheet is (d is the distance of point from plane sheet)
Question 96 :
A ball of radius R carries a positive charge whose volume charge density depends only on the distance r from the ball's centre as: $\rho=\rho_0(1-\dfrac {r}{R})$ where $\rho_0$ is constant. Assume $\epsilon$ as the permittivity of the ball.<br/>Then the magnitude of the electric field as a function of the distance r outside the ball is given by :
Question 97 :
Charges Q, 2Q and 4Q are uniformly distributed in three dielectric solid spheres 1,2 and 3 of radii R/2,R and 2R respectively. If magnitudes of the electric fields at point P at a distance R from the centre of sphere 1, 2 and 3 are $E_1$, $E_2$ and $E_3$ respectively, then :<br/>
Question 98 :
A solid sphere of radius $R$ has a charge $Q$ distributed in its volume with a charge density $\rho =\kappa { r }^{ a }$, where $\kappa$ and $a$ are constants and $r$ is the distance from its centre.<br>If the electric field at $r=\cfrac{R}{8}$ is $\cfrac{1}{8}$ times that at $r=R$, find the value of $a$ .
Question 99 :
Let $E_1(r), E_2(r)$ and $E_3(r)$ be the respective electric fields at a distance r from a point charge Q, an infinitely long wire with constant linear charge density $\lambda$, and an infinite plane with uniform surface charge density $ \sigma $. lf $E_1(r_0) = E_2(r_0) = E_3(r_0)$ at a given distance $r_0$, then :<br/>
Question 100 :
A point charge $Q(C)$ is placed at the origin. Find the electric flux of which an area $4\pi\ m^2$ on a concentric spherical shell of radius $R$
Question 101 :
Mathematically, electric flux can $\phi$be represented as:<br><br>$\vec E =$ electric field<br>$\hat n=$ surface normal vector<br>$A=$ surface area
Question 102 :
A point charge $q$ is situated at a distance $r$ on axis from one end of a thin conducting rod of length $L$ having a charge $Q$ (Uniformly distributed along its length). The magnitude electric force between the two is _______
Question 103 :
Compute the electric flux through a square surface of edges $2l$due to a charge $+Q$ whose geometric centre islocated on the x-axis at a perpendicular distance $l$ from the centre of the square.
Question 104 :
In a region, volume density of charge varies with the y-coordinate according to the law $\rho = a|y|$. The electric field as a function of distance y is given by $E = \frac {ay^2}{2^n \epsilon_0}$. Value of n is ('a' is a positive constant):
Question 106 :
Given a uniform electric field $E=5 \times 10^3\hat i N/C$. Find the flux of this field through a square of side $10cm$ on a side whose plane is parallel to YZ-plane :
Question 108 :
A charge Q is distributed uniformly in a sphere (solid). Then the electric field at any point r where r < R (R is radius of the sphere) varies as
Question 109 :
Assertion: STATEMENT-1 : In a region where uniform electric field exists, the net charge within volume of any size is zero.
Reason: STATEMENT-2 : The electric flux within any closed surface in a region of uniform electric field is zero.
