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Q.

The capacity and the energy stored in a parallel plate condenser with air between its plates are respectively C0 and W0. If the air is replaced by glass (dielectric constant = 5) between the plates, the capacity of the plates and the energy stored in it will respectively be

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a

5Co, 5Wo

b

5Co, W05

c

Co5, 5Wo

d

Co5, Wo5

answer is B.

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Detailed Solution

When a dielectric K is introduced in a parallel plate condenser its capacity becomes K times. Hence C'=5C0 . Energy stored W0=q22C0∴W′=q22C′=q22×5C0⇒W′=W05
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The capacity and the energy stored in a parallel plate condenser with air between its plates are respectively C0 and W0. If the air is replaced by glass (dielectric constant = 5) between the plates, the capacity of the plates and the energy stored in it will respectively be