Question 1 :
Two identical metallic spheres A and B of exactly equal masses are given equal positive and negative charge respectively. Then:
Question 2 :
Two charged spheres separated at a distance d exert a force F on each other. If they are immersed in a liquid of dielectric constant 2, then the force (if all conditions are same) is :
Question 3 :
Deuteron and $\alpha$-particle are put $1{A}^{o}$ apart in air. Magnitude of intensity of electric field due to deuteron of $\alpha$-particle is $(N/C)$<b></b>
Question 4 :
An instrument used in electrostatics to detect thepresence of electric charge on a body is called ..............
Question 6 :
State True or False :Human body is a good conductor of electricity.
Question 7 :
A charged body is brought near an uncharged gold leaf electroscope. What will be your observation if the body is charged?
Question 9 :
Two electric dipoles of dipole moment $2 \space cm$ and $4 \space cm$ respectively are kept inside a cube of side $'a' \space m$. Total electric flux linked with the cube is (in SI units)
Question 11 : <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"><p class="wysiwyg-text-align-left">Two unlike charges attract each other with a force of 10N. If the distance between them is doubled, the force between them is :</p>
Question 12 :
Two equations are given below:<br>A) $\oint \overline {E} .d\overline {A} = \dfrac {Q}{E_{0}}$ B) $\oint \overline {B} . d\overline {A} = 0$
Question 13 :
State whether the given statement is True or False :Conductors when charged transfer all charges to the entire surface of the conductor. 
Question 14 :
In an external electric field, the field line of force represent:<br/>
Question 15 :
A gold leaf electroscope is given a positive charge so that its leaves diverge. How is the divergence of leaves affected, when a positively charged rod is brought near its disc?
Question 16 :
An electron of mass m. initially at rest takes time $t_1$ to move a distances in a uniform electric field in the same field environment, a proton of mass mp initially at rest takes time $t_2$ to move the same distance (in the opposite direction). Ignoring gravity, the ratio $t_2/t_1$ is<br>
Question 17 :
If a charge on the body is 1 nC, then how many electrons are present on the body?
Question 18 :
A charge q is located at the centre of a cube. The electric flux thorugh any face is?
Question 19 :
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 20 : <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"><p class="wysiwyg-text-align-left">A force ‘F’ is acting between two charges in air. If the space between them be completely filled with a medium $K=4$, the force will be :</p>
Question 21 :
The force acting between two point charges kept at a certain distance is $5$N. Now the magnitudes of charges are doubled and distance between them is halved, the force acting between them is _________ N.
Question 22 :
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 23 :
The specific charge of a proton is $9.6 \, \times \, 10^7 \, C \, kg^{-1}$ The specific charge of an alpha particle will be
Question 24 :
Which of the following devicesis used to detect the presences of a charge on a body?<br>
Question 28 :
What will be the nature of charge on the metal paper clip of electroscope when a positively charged body is brought in contact with it?
Question 29 : <p class="wysiwyg-text-align-left">A charge $Q\  \mu C$ is placed at the centre of a cube. The flux coming out from any surface will be :<br/></p>
Question 31 : <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 32 : <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"><p>Total Electric flux at a point in an electric field is</p>
Question 33 :
The electric potential is $V=x^2-2x$. What us the electric field strength at $x=1?$
Question 35 :
Some materials have electrons that are tightly bound to the nucleus and are not free to travel within the substance. These materials are called .............
Question 38 :
What will bethe effect on the divergence of the leaves of aunchargedgold leaf electroscope onbringing a negatively charged rod near electroscope?
Question 40 :
A negative charge is placed at the midpoint between two fixed equal positive charges, separated by a distance $2d$. If the negative charge is given a small displacement $x (x << d)$ perpendicular to the line joining the positive charges, how<br/>the force (F) developed on it will approximately depend on $x$ ?
Question 41 :
State whether true or false :Electric flux through a closed surface is equal to total flux due to all the charges enclosed within that surface only.
Question 42 : <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"><p class="wysiwyg-text-align-left">The electric field due to a charge at a distance of $3m$ from it is $500 N/C$. The magnitude of the charge is$\left [ \dfrac{1}{4\pi \varepsilon _{0}}=9\times 10^{9}Nm^{2}/C^{2} \right ]$ :</p>
Question 43 :
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 46 :
A hollow conducting sphere of charge does not have electric field at
Question 47 :
State whether true or false:<br/>Alcohol and ether are conducting liquids of electricity. <br/>
Question 49 :
The inward and outward electric flux from a closed surface are respectively $ 8\times 10^{3}$ and $ 4\times 10^{3}$ units.Then the net charge inside the closed surface is
Question 50 :
State whether true or false.<br/>Pure water is a good conductor of electricity.<br/>
Question 51 :
A charged spherical conductor has a surface charge density of $0.07$ $C/m^{2}$ . When its charge is increased by $0.44C$, the charge density changes by $0.14$ $C/m^{2}$. The radius of the sphere is :<br>
Question 52 :
On the axis and on the equator of an electric dipole for all points _________.
Question 53 :
A charge q is enclosed in a cube. What is electric flux associated with one of the faces of the cube?
Question 54 :
An electric dipole is placed at the origin and is directed along the x-axis. At a point P, far away from the dipole,the electric field is parallel to the y-axis. OP makes anangle $\theta$ with the x-axis. Then,
Question 55 :
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 56 :
A square current carrying loop is suspended in a uniform magnetic field acting in the plane of the loop. If the force on one arm of the loop is<b>F</b>, the net force on the remaining three arms of the loop is:
Question 57 :
Two point charges placed at a certain distance r in air exert a force F on each other. The distance r at which these charges will exert the same force in medium if dielectric constant k is given by
Question 58 :
Given that $q_1 + q_2 = q$. If the force between $q_1$ and $q_2$ is maximum, then $\dfrac{q_1}{q_2}$ is
Question 59 :
A charge $Q$ is kept at the corner of a cube. Electric flux passing through one of those faces not touches that charge is:-
Question 60 :
A charge q is placed at the centre of the line joining two exactly equal positive charges Q. The systems of these charges will be in equilibrium, if q is equal to<br>
Question 61 :
A tiny spherical oil drop carrying a net charge q is balance in still air with a vertical uniform electric field of strength $\dfrac { 8L\pi  }{ 7 } \times 1{ 0 }^{ 5 }\quad V{ m }^{ -1 }$. When the field is switched off, the drop, observed to fall with terminal velocity $2\times 1{ 0 }^{ -3 }\quad { ms }^{ -1 }\quad given\quad g=9.8{ ms }^{ -2 }$, viscosity of the air =$1.8\times 1{ 0 }^{ -5 }Nsm^{ -2 }$ and the density of oil =900 kg${ m }^{ -3 }$, the magnitude of q is<br/>
Question 62 :
If both the spheres are connected by a conducting wire, then
Question 63 :
An electric dipole of moment p is kept along an electric field E. The work done in rotating it from an equilibrium position by an angle $\theta$ is :
Question 64 :
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 65 : <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"><p class="wysiwyg-text-align-left">Equal and similar charges are placed on the earth and the moon. The numerical value of charge required to neutralise their gravitational attraction is (Given: mass of earth$=6\times 10^{24}kg$, Mass of moon$=7\times 10^{22}kg$) :<br/></p>
Question 66 :
Ten positively charged particles are kept fixed on the $x-$ axis at points $x=10\ cm, 20\ cm, 30\ cm, . . . .,100\ cm$. The first particle has a charge $1.0\times {10}^{-8}\ C$, the second $8\times {10}^{-8}\ C$, the third $27\times {10}^{-8}\ C$ and so on. The tenth particle has a charge $1000\times {10}^{-8}\ C$. Find the magnitude of the electric force acting on a $1\ C$ charge placed at the origin.
Question 67 :
An electric dipole is placed at the centre of a sphere. Mark the correct options :
Question 68 :
Two point charges $+q$ and $-q$ are placed at a distance x apart. A third charge is placed in such a way so that all the three charges are in equilibrium. Then :
Question 69 :
An electric dipole is placed at an angle of ${30}^{o}$ with an electric field of intensity $2\times {10}^{5}N{C}^{-1}$. It experiences a torque of $4Nm$. Calculate the charge on the dipole if the dipole length is $2cm$ :
Question 70 :
Three charge $q,Q,4q$ are placed in a straight line of length $l$ at points distant $0,\cfrac{l}{2},l$ respectively from one end. In order to make the net force on $q$ zero, the charge $Q$ must be equal to :
Question 71 :
Two similar and identical metal spheres $A$ and $B$ repel each other with a force of $2\times10^{-5} N$. AThird identical uncharged sphere $C$ is touched with $A$ and then placed at the mid-point of $AB$. What is the net electric force on $C$?
Question 72 :
State whether true or false :A piece of fresh potato does not conduct electricity at all.
Question 74 :
A cube of  side 5 cm has a charge of 6 $\mu$C . The surface charge density in $mu$C /m$^{2}$ is 
Question 75 :
How many electrons make up a charge of $\displaystyle 20\mu C$ ?
Question 76 :
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 77 :
Charges $Q_1$ and $Q_2$ are placed inside and outside respectively of an uncharged conducting shell. Their seperation is r.
Question 78 :
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 79 :
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 80 :
The ratio of the energy required to set up in cube of side 10 cm uniform magnetic field of 4${ Wb/m }^{ 2 }$ and a uniform electric field of $10^{ 6 }V/m$ is:
Question 81 :
Fill in the blanks.<br/>A field normal to the plane of a circular wire n turns and radius r which carries a current I is measured on the axis of the coil at small h distance h from the centre of the coil. This is smaller than the field at the centre by a friction ____
Question 82 :
Find the electric field at a distance $x$ from the centreinside the shell.
Question 83 :
A point charge +q is placed at the centre of a cube of side L. The electric flux emerging from the cube is-
Question 85 :
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 86 :
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 87 :
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 88 :
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 89 :
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.
Question 90 :
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 91 :
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 92 :
The value of distance $r_m$ at which electric field intensity is maximum, is given by :
Question 93 :
Consider an area element $dS$ at a distance $r$from a point P. Let $\hat r$be the unit vector along the outward normal to $dS$.If $\alpha$ is the angle between $\hat r$ and $dS$,the element of the solid angle subtended by the area element at P is defined as
Question 94 :
An electric charge $q$is placed at the centre of a cube of side $a$ The electric flux throughone of its faces is
Question 95 :
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 96 :
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 97 :
Electric field at the surface of a charged conductor is proportional to
Question 98 :
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 99 :
A particle of mass $m$ and charge $q$ at rest is released in a uniform electric field between parallel planes of charge $+q$ and $-q$ respectively. The particle accelerates towards the other place a distance $'d'$ away. The speed at which it strikes the opposite plane is:
Question 100 :
Using general logic for electric field, the flux of $\overrightarrow{g}$ through any closed surface is given by :
