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Alternating Current question bank (Physics)

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Q1.

In a $L R$ circuit of $3 \mathrm{mH}$ inductance and $4 \Omega$ resistance, $\operatorname{emf} E=4 \cos 1000 t$ volt is applied. The amplitude of current is

(A)

$0.8 Å$

(B)

$\frac{4}{7} Å$

(C)

$1.0 Å$

(D)

$\frac{4}{\sqrt{7}} Å$

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Q2.

What is the value of inductance $L$ for which the current is a maximum in a series $L C R$ circuit with $C=10 \mu \mathrm{F}$ and $\omega=1000 \mathrm{~s}^{-1}$ ?

(A)

$100 \mathrm{mH}$

(B)

$1 \mathrm{mH}$

(C)

Cannot be calculated unless $R$ is known

(D)

$10 \mathrm{mH}$

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