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Q.

Same current is flowing in two alternating circuits. The first circuit contains only inductor and the other contains only a capacitor. If the frequency of the e.m.f. of AC is increased, the effect on the value of the current will be

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a

Increased in the first circuit and decreased in the other

b

Increased in both the circuits

c

Decreased in both the circuits

d

Decreased in the first circuit and increased in the other

answer is D.

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Detailed Solution

For the first circuit, i=VXc=VωL=V2πνL⇒i∞1ν In the second circuit, i=VXc=V1ωc=2πVν ⇒i∞ν
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Same current is flowing in two alternating circuits. The first circuit contains only inductor and the other contains only a capacitor. If the frequency of the e.m.f. of AC is increased, the effect on the value of the current will be