Question 1 :
The electric charges are distributed in a small volume. The flux of the electric field through a spherical surface of radius $10cm$ surrounding the total charge is $20Vm$. The flux over a concentric sphere of radius $20cm$ will be

Question 2 :
$1$C of charge is placed at the centre of cube of side $5$cm the electric flux coming out from any face of the cube is?

Question 3 :
Three rigid rods are joined from an equilateral triangle ABC of side 1 m. Three particles carrying charges 20$\mu$C each are attached to the vertices of the triangle. The whole system is at rest in an inertial frame.The resultant force on the charged particle at A has the magnitude

Question 4 :
Charge $Q$, is divided into two parts which are then kept some distance apart. The force between them will be maximum if the two parts are having the charge.

Question 5 :
Assertion: Electric filed of a dipole can't be found using only Gauss law. (i.e. without using superposition principle) Reason: Gauss law is valid only for symmetrical charge distribution.

Question 6 :
A uniform wire of length $2.0m$ and cross-sectional area ${ 10 }^{ -7 }{ m }^{ 2 }$ carries a current of $1.6A$. If there are ${10}^{28}$ free electrons per ${m}^{3}$ in copper, the drift speed of electrons in copper is

Question 7 :
A charge q is placed at the centre of the line joining two equal charges Q. The system of the three charges will be in equilibrium if q is equal to :

Question 8 :
A conducting ball is positively charged and another positive point charge is brought closer to the ball

Question 9 :
A point charge $+q$ is placed at the centre of a cube of side $L$. The electric flux emerging from the cube is

Question 10 :
An $\alpha$ particle is situated in an electric field of strength $15\times {10}^{4}N{C}^{-1}$. Force acting on it is

Question 11 :
The density of field lines surrounding any given object reveal information about the

Question 12 :
Twelve charges of charge $q$ are situated at the corners of the 12 sided polygon of side $a$. What is net force on the charge $Q$ at the centre

Question 13 :
Let $\displaystyle { E }_{ a }$ be the electric field due to a dipole in its axial plane distant $\displaystyle \ell $ and $\displaystyle { E }_{ q }$ be the field in the equatorial plane distant $\displaystyle { l }^{ 1 }$, then the relation between $\displaystyle { E }_{ a }$ and $\displaystyle { E }_{ q }$ will be :

Question 14 :
Two spherical conductors B and C having equal radii and carrying equal charges in them repel each other with a force F when kept apart at some distance. A third spherical conductor having same radius as that of B but uncharged, is brought in contact with B, then brought in contact with C and finally removed away from both. The new force of repulsion between B and C is:

Question 15 :
Electric charges are distributed in a small volume. The flux of the electric field through a spherical surface of radius $10$ cm surrounding the total charge is $25$ V-m. The flux over concentric sphere of radius $20$ cm will be : 

Question 16 :
$12$ positive charges each of magnitude q are placed on a circle of radius $R$ in a manner such that they are equally spaced. A charge $+Q$ is placed at the centre. If one of the charges q is removed, then the force on $Q$ is :

Question 17 :
A charge of magnitude $\mathit{Q}$ is placed at the origin. A second identical charge is placed at the position $\mathit{x=d}$ along the x-axis. Other than infinitely far away, at what position on the x-axis will a positive test charge experience a zero net force?

Question 18 :
<p>In instantaneous current in a metallic wire is${\rm{i = }}\left( {{\rm{5 + 10t}}} \right){\rm{A}}$ then find amount of charge flown through it from t=2s to t=3s is</p>

Question 19 :
A particle A having a charge of $2.0 \times 10^{-6}$C and a mass of 100 g is fixed at the bottom of a smooth&#160;inclined plane of inclination $30^{\circ}$. Where should another particle B having same charge and mass, be&#160;placed on the inclined plane so that B may remain in equilibrium?

Question 20 :
Two thin infinite parallel sheets have uniform surface densities of charge $+\sigma$ and $-\sigma$. Electric field in the space between the two sheets is :