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Two identical capacitors and are connected in series. The capacitor contains a dielectric slab of constant as shown. They are connected to a battery of emf volts. The dielectric slab is then removed. Let and be the charge stored in the capacitors before removing the slab and and be the values after removing the slab. Then


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(b)
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(d)

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Important Questions on Electrostatic Potential and Capacitance
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JEE Main/Advance
IMPORTANT
Two capacitors of capacitances microfarad and microfarad are each charged by being connected across a -volt battery. They are disconnected from the battery and then connected to each other with resistive wires so that plates of opposite charge are connected together. What will be the magnitude of the final voltage across the -microfarad capacitor?

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JEE Main/Advance
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A capacitor is charged with a di-electric slab in the space between the plates of capacitor. The battery is disconnected and the di-electric slab is pulled out of the space. Then the force of capacitor upon slab

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JEE Main/Advance
IMPORTANT
Find the electrostatic potential energy of the system shown in the figure.

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JEE Main/Advance
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Two charges and are placed at and on the axis. Another charge is taken from to , then the work done to do so

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JEE Main/Advance
IMPORTANT
In moving a unit positively charged body from point to point , external work done is and body acquires a kinetic energy of The potential difference, , is

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JEE Main/Advance
IMPORTANT
A charge of is uniformly distributed on a ring of radius Find the potential at the axis at a distance of from the centre.

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JEE Main/Advance
IMPORTANT
In which of the following case, potential at point is not zero?

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JEE Main/Advance
IMPORTANT
In any region, if electric field is define as , then the potential difference between two points and in that region, is
