Electro Magnetic Induction And Alternating Currents Question 40

Question: When 100 volt dc is applied across a coil, a current of 1 amp flows through it. When 100 volt ac at 50 cycle $ {{s}^{-1}} $ is applied to the same coil, only 0.5 ampere current flows. The impedance of the coil is [Bihar MEE 1995]

Options:

A) $ 100,\Omega $

B) $ 200,\Omega $

C) $ 300,\Omega $

D) $ 400,\Omega $

Show Answer

Answer:

Correct Answer: B

Solution:

When dc is supplied $ R=\frac{V}{i}=\frac{100}{1}=100,\Omega , $ When ac is supplied $ Z=\frac{V}{i}=\frac{100}{0.5}=200,\Omega , $



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