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Electrostatic Potential and Capacitance
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Electrostatic Potential and Capacitance
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13 Questions

1. The capacity of a parallel plate condenser is 10 μFwhen the distance between its plates is 8 cmIf thedistance between the plates is reduced to 4 cm then thecapacity of this parallel plate condenser will be [2001]
2. Three capacitors each of capacity 4μF are to beconnected in such a way that the effective capacitance is6 μF. This can be done by [2003]
3. A condenser of capacity C is charged to a potentialdifference of V1The plates of the condenser are thenconnected to an ideal inductor of inductance LThecurrent through the inductor when the potentialdifference across the condenser reduces to V2 is
4. Four point charges -“ -“q - 2q and 2 are placed - one at each corner of the squareThe relation between and q for which the potential at the centre of the squareis zero is: [2012][NEET2013]
5. If the potential of a capacitor having capacity 6 μF isincreased from 10 V to 20 V - then increase in its energywill be [1995]
6. A capacitor is charged to store an energy UThecharging battery is disconnectedAn identical capacitoris now connected to the first capacitor in parallel.The energy in each of the capacitor is [2000]
7. A solid spherical conductor is given a chargeTheelectrostatic potential of the conductor is [2002]
8. An electric dipole has the magnitude of its chargeas q and its dipole moment is pIt is placed in uniformelectric field EIf its dipole moment is along thedirection of the field - the force on it and its potentialenergy are respectively [2004]
9. A 4µF conductor is charged to 400 volts and thenits plates are joined through a resistance of 1 kΩ. Theheat produced in the resistance is [1989]
10. Three concentric spherical shells have radii a - band c (a < b < c) and have surface charge densities Ï‚ - -“ Ï‚and Ï‚ respectivelyIf VA - VB and VC denotes thepotentials of the three shells - then for c = a + b - we have[2009]
11. A hollow metal sphere of radius 10 cm is chargedsuch that the potential on its surface is 80 V. The potential at the centre of the sphere is [1994]
12. Three capacitors each of capacitance C and ofbreakdown voltage V are joined in seriesThecapacitance and breakdown voltage of the combinationwill be [2009]
13. The potential energy of particle in a force field is U= A/r2 -“ B/r - where A and B are positive constants and ris the distance of particle from the centre of the fieldForstable equilibrium - the distance of the particle is: [2012]

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