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1.
A 
capacitor is charged from 
to 
Increase in energy will be
capacitor is charged from to Increase in energy will be
2.
A ring of radius 
carries a charge 
uniformly distributed over its length. A charge 
is placed at its centre will experience a force equal to
carries a charge uniformly distributed over its length. A charge is placed at its centre will experience a force equal to
3.
Two point charge 
and 
are situated at the origin and at the point 
respectively. The point along the 
-axis where the electric field vanishes is
and are situated at the origin and at the point respectively. The point along the -axis where the electric field vanishes is
4.
The electric field at a point on equatorial line of a dipole and direction of the dipole moment
5.
A solid sphere of radius 
and volume charge density 
is enclosed by a hollow sphere of radius 
with negative surface charge density
, such that the total charge in the system is zero,
is a positive constant and is the distance from the centre of sphere. The ratio 
is
and volume charge density is enclosed by a hollow sphere of radius with negative surface charge density, such that the total charge in the system is zero, is a positive constant and is the distance from the centre of sphere. The ratio is