Electro Magnetic Induction And Alternating Currents Question 58

Question: A resistance of 40 ohm and an inductance of 95.5 millihenry are connected in series in a 50 cycles/second ac circuit. The impedance of this combination is very nearly [MP PET 2000]

Options:

A) 30 ohm

B) 40 ohm

C) 50 ohm

D) 60 ohm

Show Answer

Answer:

Correct Answer: C

Solution:

$ Z=\sqrt{R^{2}+{{(2\pi \nu L)}^{2}}} $ $ =\sqrt{{{(40)}^{2}}+4{{\pi }^{2}}\times {{(50)}^{2}}\times {{(95.5\times {{10}^{-3}})}^{2}}}=50ohm $



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