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Q.

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A resistance R and a capacitor C are joined to a source of ac of constant emf and variable frequency. The potential difference across C is V. If the frequency of ac is gradually increased, V will

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a

decrease

b

Increase

c

remain constant

d

first increase and then decrease

answer is B.

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Detailed Solution

current i=∈z=∈R2+Xc2

where xc=1cω=12πnc

potential difference across capacitor V=IXC =∈XCR2+Xc2

with increase of frequency(n)  v decreases as V is inversely related to n.

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