Electro Magnetic Induction And Alternating Currents Question 35

Question: An e.m.f. $ E=4\cos (1000t) $ volt is applied to an LR-circuit of inductance 3 mH and resistance 4 ohms. The amplitude of current in the circuit is [MP PMT 1997]

Options:

A) $ \frac{4}{\sqrt{7}}A $

B) 1.0 A

C) $ \frac{4}{7}A $

D) 0.8 A

Show Answer

Answer:

Correct Answer: D

Solution:

$ i=\frac{V}{Z}=\frac{4}{\sqrt{4^{2}+{{(1000\times 3\times {{10}^{-3}})}^{2}}}}=0.8A $



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