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 s1 is applied to the same coil, only 0.5 ampere current flows. The impedance of the coil is [Bihar MEE 1995]

Options:

A) 100,Ω

B) 200,Ω

C) 300,Ω

D) 400,Ω

Show Answer

Answer:

Correct Answer: B

Solution:

When dc is supplied R=Vi=1001=100,Ω, When ac is supplied Z=Vi=1000.5=200,Ω,



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