Electro Magnetic Induction And Alternating Currents Question 80

Question: The resistance of a coil for dc is in ohms. In ac, the resistance [CPMT 1987]

Options:

A) Will remain same

B) Will increase

C) Will decrease

D) Will be zero

Show Answer

Answer:

Correct Answer: B

Solution:

The coil having inductance L besides the resistance R. Hence for ac it’s effective resistance $ \sqrt{R^{2}+X_{L}^{2}} $ will be larger than it’s resistance R for dc.



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