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Question

# When a slab of dielectric medium is placed between the plates of a parallel plate capacitor which is connected with a battery, then the charge on plates in comparision with earlier charge:

A
is less
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B
is same
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C
is more
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D
depends on the dielectric constant
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Solution

## The correct option is C is moreBefore the dielectric is inserted, the charge on the plates is given by Q=CVAfter the dielectric of dielectric constant K is inserted with battery connected, the charge becomes Q′=KCV [ when a battery is connected to the capacitor, potential difference across its plates will remain constant ] As the dielectric constant is always greater than 1, so Q′>Q. Hence , option (c) is correct answer. Key Concept- The capacitance increases by a factor K with the introduction of a dielectric material completely occupying the space between the plates.

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