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Assertion: The dipoles in a dielectric are not completely aligned in a weak external electric field.

Reason: Thermal energy tends to de-align them.

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Important Questions on Capacitance

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Beta Question Bank for Medical: Physics>Chapter 23 - Capacitance>Exercise (Conceptual Questions)>Q 90
The energy density associated with the electric field will be -
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Beta Question Bank for Medical: Physics>Chapter 23 - Capacitance>Exercise (Previous Year Questions)>Q 1
Two conductors are of same shape and size. One of copper and the other of aluminium (less conducting) are placed in an uniform electric field. The charge induced in aluminium :
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Beta Question Bank for Medical: Physics>Chapter 23 - Capacitance>Exercise (Previous Year Questions)>Q 2

A big hollow metal sphere A is charged to 100 volts  and another smaller hollow sphere B is charged to 50 volts. If B is put inside A and joined with a metallic wire, then the direction of charge flow :-

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Beta Question Bank for Medical: Physics>Chapter 23 - Capacitance>Exercise (Previous Year Questions)>Q 3
Electric field at a distance 'r' from an infinitely large conducting sheet is proportional to: