Q. Assertion: A parallel plate capacitor is connected across battery through a key. A dielectric slab of dielectric constant is introduced between the plates. The energy which is stored becomes times.
Reason: The surface density of charge on the plate remains constant or unchanged.

AIIMS AIIMS 2008 Report Error

A

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

B

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

C

If Assertion is true but Reason is false.

D

If both Assertion and Reason are false.

Solution:

If a dielectric slab of dielectric constant is filled in between the plates of a condenser while charging it, the potential difference between the plates does not change but the capacity becomes times, therefore
Energy stored in the capacitor

Thus, energy stored becomes times. Surface charge density

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