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Electrostatic Potential and Capacitance
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Electrostatic Potential and Capacitance
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13 Questions

1. 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]
2. 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]
3. Three capacitors each of capacitance C and ofbreakdown voltage V are joined in seriesThecapacitance and breakdown voltage of the combinationwill be [2009]
4. 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]
5. 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]
6. 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]
7. If the potential of a capacitor having capacity 6 μF isincreased from 10 V to 20 V - then increase in its energywill be [1995]
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. 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]
10. If the potential of a capacitor having capacity 6 μF isincreased from 10 V to 20 V - then increase in its energywill be [1995]
11. 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]
12. 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]
13. 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]

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