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Two identical capacitors 1 and 2 are connected in series. The capacitor 2 contains a dielectric slab of constant K as shown. They are connected to a battery of emf V0 volts. The dielectric slab is then removed. Let Q1 and Q2 be the charge stored in the capacitors before removing the slab and Q'1, and Q'2 be the values after removing the slab. Then

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Important Questions on Electrostatic Potential and Capacitance

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JEE Main/Advance
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Two capacitors of capacitances 1.0 microfarad and 2.0 microfarad are each charged by being connected across a 5.0-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 2.0-microfarad capacitor?
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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
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Find the electrostatic potential energy of the system shown in the figure.

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Two charges q and -q are placed at (a, 0) and (-a, 0) on the x-axis. Another charge 2q is taken from (0, 0) to (0, a), then the work done to do so
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In moving a unit positively charged body from point A to point B, external work done is 40 J and body acquires a kinetic energy of 20 J. The potential difference, VB-VA, is
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A charge of 5 nC is uniformly distributed on a ring of radius 4 cm. Find the potential at the axis at a distance of 3 cm from the centre.
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JEE Main/Advance
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In which of the following case, potential at point O is not zero?
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In any region, if electric field is define as E=(i^+2j^+k^)V/m, then the potential difference between two points A(0, 0, 0) and B(2, 3, 4) in that region, is