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There are two identical capacitors, the first one is uncharged and filled with a dielectric constant K while the other one is charged to potential V having air between its plates. If two capacitors are joined end to end, the common potential will be

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Important Questions on Electrostatic Potential and Capacitance

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If initial charge on all the capacitors were zero, work done by the battery in the circuit shown is

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A capacitor of capacitance C is charged with the help of a 200 V battery. It is then discharged through a small coil of resistance wire embedded in a thermally insulated block of specific heat capacity 2.5×102 Jkg and mass 0.1 kg. If the temperature of the block rises by 0.4 K,  the value of C is
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How many 1 μF capacitors must be connected in parallel to store a charge of 1 C with a potential of  110 V across the capacitors ?
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A hollow metal sphere of radius 10 cm is charged such that the potential on its surface becomes 80 V. The potential at the centre of the sphere is
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Charge q2 is at the centre of a circular path with radius r. Work done in carrying charge q1 once around this equipotential path, would be
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An electric dipole of dipole moment p is placed in the position of stable equilibrium in uniform electric field of intensity E. This is rotated through an angle θ from the initial position. The potential energy of the electric dipole in the final position is
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There is an electric field E in x- direction. If the work done on moving a charge of 0.2C through a distance of 2m along a line making an angle 60° with x- axis is 4J then what is the value of E ?