Electrostatic Potential And Capacitance

Physics
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Two charges and are kept apart. Then at any point on the perpendicular bisector of line joining the two charges:

A
the electric field strength is zero
B
the electric potential is zero
C
both electric potential and electric field strength are zero
D
both electric potential and electric field strength are non-zero
Medium
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A condenser is charged and then battery is removed. A dielectric plate is put between the plates of condenser, then correct statement is

A
Q is constant, V and U decrease
B
Q is constant, V increases U decreases
C
Q increases, V decreases U increases
D
Q, V and U increase
Medium
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A positive point charge q is carried from a point B to a point A in the electric field of a point charge +Q. If the permittivity of free space is the work done in the process is given by

A
B
C
D
Medium
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One plate of parallel plate capacitor is smaller than the other. The charge on the smaller plate:

A
will be less than other
B
will be more than other
C
will be equal to other
D
will depend upon the medium between the plates 
Medium
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