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. $
