Question 1 :
The sum total of the number of electrons in a system may change. The statement is :<br/>
Question 3 :
12 positive charges of magnitude q are placed on a circle of radius R in a manner that they are equallyspaced. A charge +Q is placed at the centre. If one of the charges q is removed, then the force on Q is
Question 5 :
The specific charge of a proton is $\displaystyle 9.6\times { 10 }^{ 7 }C/kg$. The specific charge of an alpha particle will be:
Question 6 :
A gold leaf electroscope is given a positive charge so that its leaves diverge. How is the divergence of leaves affected, when a negatively charged rod is brought near its disc?
Question 7 :
Two point charges $+3\mu C$ and $+8\mu C$ repel each other with a force of $40 N$. If a charge of $-5\mu C$ is added to each of them, the force between them will become:
Question 8 :
A drop of oil of density $\rho$ and radius $r$ carries a charge $q$ when placed in an electric field $E$, it moves upwards with a velocity $v$. If ${\rho}_{0}$ is the density of air, $\eta $ be the viscosity of the air, then which of the following force is directed upwards?
Question 9 :
Which of the following statements are true:A: Charge cannot exist without mass but mass can exist without charge<br/>B: Charge is invariant but mass varies with velocity<br/>C: Charge is conserved but mass alone may not be conserved
Question 10 :
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 11 :
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 13 :
In a region of space having a uniform electric field $E$, a hemispherical bowl of radius $r$ is placed. The electric flux $\phi$ through the bowl is
Question 14 :
What will bethe effect on the divergence of the leaves of aunchargedgold leaf electroscope onbringing a negatively charged rod near electroscope?
Question 15 :
State True or False :Human body is a good conductor of electricity.
Question 16 :
<span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">Another unit for the quantity having the unit $\dfrac{C^2 }{Nm^2}$ is:
Question 17 :
Two spheres of radii 2 cm and 3 cm have equal surface charge density. Calculate the ratio of their charges.
Question 18 :
The mud houses are cooler in summer and warmer in winter. It happen due to the reason that.
Question 19 :
Uniform electric field of intensity 5 volt/m acts parallel to x axis. A charge of 2C is moved from to A (1,1), to B (2,1) and finally to D(3,C) in this field.Work done in this process is :
Question 22 :
Electric field at a distance r from infinitely long conducting sheet is proportional to :
Question 24 :
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 28 :
If a body acquires electric charge temporarily under the influence of charged body, then the process is called:
Question 29 :
The laws of forces that govern the force between two electric charges were discovered by :
Question 30 : <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"><p class="wysiwyg-text-align-left">A charge q is enclosed in a cube at its geometrical centre. What is the electric flux associated with one of the faces of cube:</p>
Question 31 :
Two identical metal sphere carrying charges of $ 9 \times 10^{-9} C $ and $ -3 \times 10^{-9} $ C are brought in contact and then they are separated by a distance of 3 m and kept in a medium of dielectric constant 5. what is the electrostatic force between them ?
Question 32 :
The Electrostatic Force between two charges is 4 N. If one charge has a value of 5 $\mu$C and is 2 cm from the second charge, find the new electrostatic force if the second charge is moved 2 cm further away from the first charge.
Question 33 :
State the effect on the divergence of the leaves of a gold leaf electroscope on bringing a negatively charged rod near it if the electroscope is negatively charged :
Question 34 :
If the radius of a sphere doubled without changing the charge on it, then electric flux originating form the sphere is:
Question 35 :
The centers  of two identical small conducting spheres are $1\ m$ apart. They carry charges of opposite kind and attract each other with a force  $F$ . when they are connected by a conducting thin wire they repel each other with a force $F/3$. What is the ratio of magnitude of charges carried by the spheres initially? 
Question 36 :
A charged particle having a charge $-2\times 10^{-6} C$ is placed close to the non-conducting plate having a surface charge density $4\times 10^{-6} Cm^{-2}$. The force of attraction between the particle and the plate is nearly :
Question 37 :
The maximum Coulomb force that can act on the electron due to the nucleus in a hydrogen atom will be:-
Question 38 :
What is the direction of the electric field directly to the east of an isolated negative point charge?
Question 39 :
A body has $80$ micro-coulomb of negative charge. Number of additional electrons on it will be :
Question 40 :
Two identical conducting spheres were situated so that they were insulated from their surroundings, and their centers were separated by a distance, d.<br>One sphere had a charge of $+8$ Coulombs; the other had a charge of $-4$ Coulombs.<br>The spheres were then brought together to touch each other. The spheres were separated and again insulated from their surroundings, and their centers were separated by a distance d.<br>How does the magnitude of the electrostatic force between the spheres in their final situation compare to the magnitude of electrostatic force between them in their original situation?
Question 41 :
A electric dipole having charge $q$ and $-q$ are placed at distance $'d'$ is in equilibrium in a uniform electric filed $E$. Each charge has mass $'m'$. If dipole is displayed by small angle. Then its angular frequency of oscillation is:
Question 42 :
A dipole of dipole moment $p$ is rotated by angle $\pi$ in a uniform electric field of strength $E$. The work required.
Question 43 :
A charge $Q$ is to be divided into two parts such the force between them is maximum.They should be divided as
Question 44 :
An electric dipole of length 20 cm having $\pm3 \times { 10 }^{ -3 }$ C charge placed at 60 with respect to a uniform electric field experiences a torque of magnitude 6 N m. the potential energy of the dipole is:
Question 45 :
Under the influence of the Coulomb field of charge $+Q$, a charge $-q$ is moving around it in an elliptical orbit. Find out the correct statements.
Question 46 : <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"><p class="wysiwyg-text-align-left">At the centre of a cubical box $+ Q$ charge is placed. The value of total flux that is coming out of each face is :</p>
Question 47 :
In Region of Electric field Given by $\vec{E} = (Ax + B) \hat{i}$. Where $A = 20$ unit and $B = 10$ unit. If Electric potential at $x = 1\,m$ is $V_1$ and at $x = -5 \,m$ is $V_2$. Then $V_1 - V_2$ is equal to
Question 48 :
The electric field lines involves drawing the lines of force <u> </u>to the surfaces of objects at the locations where the lines connect to object's surfaces.
Question 49 :
An $\alpha$ particle is situated in an electric field of strength $15\times {10}^{4}N{C}^{-1}$. Force acting on it is
Question 50 :
A given charge situated at a certain distance from an electric dipole in the end on position, experiences a force F. If the distance of the charge is doubled, the force acting on the charge will be :
Question 51 :
An electric dipole of dipole moment $\vec { p } $ is placed in a uniform electric field $\vec { E } $. The maximum torque experienced by the dipole is
Question 52 :
Five balls numbered $1$ to $5$ are suspended using separate threads. Pairs $(1,2), (2,4), (4,1)$ show electrostatic attraction while pairs $(2,3), (4,5)$ show repulsion. There ball $1$ must be
Question 53 :
A cylinder of length $l$ and radius $R$ is placed in a uniform electric field $E$ parallel to the cylindrical axis. The total flux through the surface of the cylinder is given by
Question 54 :
Four positive charges $(2\sqrt 2 - 1)$ Q are arranged at the four corner of a square. Another charge q is placed at the centre of the square. Resulting force acting on each corner charge is zero if q is :
Question 55 :
Two charges are at a distance $d$ apart. If a copper plate of thickness $d/2$ is kept between them, then effective force will be
Question 56 :
For a given surface the Gauss's law is stated as $\int E.ds = 0$. From this we can conclude that :
Question 57 :
The electrostatic force between two point charges $q_1$ and $q_2$ at separation 'r' is given by $F=\dfrac {Kq_1q_2}{r^2}$. The constant K
Question 58 :
A non-conducting ring of radius $0.5 m$ carries a total of $1.11 \times 10^{-10}C$, distributed non-uniformly on its circumference, producing an electric field in space. The value of the line integral $- \int_{\infty}^{\ell}\overrightarrow{E} \cdot d\overrightarrow{\ell}$ ($\ell = 0$being the centre of the ring), in volt, is ______.
Question 59 :
If the electric field is given by $(5i+4j+9k)$, the electric flux through a surface of area $20$ unit lying in the Y-Z plane will be :
Question 60 : <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"><p class="wysiwyg-text-align-left">The excess (equal in number) number of electrons that must be placed on each of the two small spheres spaced $3 cm$ apart with a force of repulsion between them to be $10^{-19} N$ is :<br/></p>
Question 61 :
A spherically symmetric charge distribution is characterised by a charge density having the following variation :<br>$p(r)=p_o(1-\frac {r}{R})$ for $r<R$<br>$p(r)=0$ for $r\geqslant R$<br>Where r is the distance from the centre of the charge distribution and $p_o$ is a constant. The electric field at an internal point (r<R) is :
Question 62 :
The electric field in a region is radially outward with magnitude $E=\alpha r$. Calculate the charge contained in a sphere of radius R centered at the origin. Calculate the value of the charge if $\alpha =100 Vm^{-2}$ and R=0.30 m.
Question 63 :
The magnitude of electric field as a function of the distance r inside the sphere is given by :
Question 64 :
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 65 :
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 66 :
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/>
