Question 2 :
When a glass rod is rubbed with silk cloth, it acquires positive charge because:

Question 4 :
A charge is kept at the centre of a shell. Shell has charge Q uniformally distibuted over its surface and radius R. The force on the central charge due to the shell is :

Question 5 :
The electric flux over a sphere of radius $1 m$ is $\phi$. If radius of the sphere were doubled without changing the charge enclosed, electric flux would become

Question 6 :
State whether true or false :Gauss law is applicable only when there is a symmetric distribution of charge.

Question 7 :
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 8 :
A rod of length L lies along the x-axis with its left end at the origin. It has a nonuniform charge&#160;density $\lambda = \alpha x$, where $\alpha$ is a positive constant.&#160;What are the units of $\alpha$?

Question 9 :
Two charges are placed a certain distance apart. A metallic sheet is placed between them. What will happen to the force between the charges?<br/>

Question 10 :
Sparking occurs when a load is switched off because the circuit has high :<br/>

Question 11 :
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 12 :
Let $E_a$ be the electric field due to a dipole in its axial&#160;a place distance l and let&#160;$E_q$&#160;be the field in the equatorial&#160;plane distance l. The relation between&#160;$E_a$ and&#160;$E_q$&#160;is :

Question 13 :
Determine the electric field everywhere outside the sphere at a distance $r(&gt;&gt;a)$ from the centre.

Question 15 :
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 $\psi$ be the flux of E over S.

Question 16 :
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 17 :
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 $&#160;\sigma $. lf $E_1(r_0) = E_2(r_0) = E_3(r_0)$ at a given distance $r_0$, then :<br/>

Question 18 :
A point charge $q$ is placed at a point on the axis of a non-conducting circular plate of radius $r$ at a distance $R (R &gt;&gt; r)$ from its center. The electric flux associated with the plate is :<br/>

Question 19 :
Two parallel large thin metal sheets have equalsurface charge densities$\displaystyle \left( \sigma =26.4\times { 10 }^{ -12 }{ c }/{ { m }^{ 2 } } \right)$ of opposite signs.<br>The electric field between these sheets is:<br><br>

Question 20 :
A point charge +q is placed at the centre of a cube of side L. The electric flux emerging from the cube is-

Question 21 :
A long cylindrical wire carries a linear charge density of $3\times 10^{-8} Cm^{-1}$. An electron revolve around it in a circular path under the influence of the attractive force. $KE$ of the electron is :