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 $
