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A condenser is charged to a p.d. of 120 volt. Its energy is 1×10-5 joule . If the battery is there and the space between plates is filled up with a dielectric medium εr=5, its new energy is

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a

10-5 J

b

2×10-5 J

c

3×10-5 J

d

5×10-5 J

answer is D.

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E1=εr×E

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