Electro Magnetic Induction And Alternating Currents Question 12

Question: A 20 volts ac is applied to a circuit consisting of a resistance and a coil with negligible resistance. If the voltage across the resistance is 12 V, the voltage across the coil is [MP PMT 1989; RPMT 1997]

Options:

A) 16 volts

B) 10 volts

C) 8 volts

D) 6 volts

Show Answer

Answer:

Correct Answer: A

Solution:

The voltage across a L?R combination is given by $ V^{2}=V_{R}^{2}+V_{L}^{2} $ $ V_{L}=\sqrt{V^{2}-V_{R}^{2}}=\sqrt{400-144}=\sqrt{256}=16volt. $



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