MHT CET · Physics · Alternating Current
The current flowing in a coil is 3 A and the power consumed is 108 W . If the a.c. source is of \(120 \mathrm{~V}, 50 \mathrm{~Hz}\), the resistance in the circuit is
- A \(24 \Omega\)
- B \(36 \Omega\)
- C \(12 \Omega\)
- D \(6 \Omega\)
Answer & Solution
Correct Answer
(C) \(12 \Omega\)
Step-by-step Solution
Detailed explanation
\(\begin{array}{ll} & \mathrm{P}=\mathrm{I}_{\mathrm{rms}}{ }^2 \mathrm{R} \\ \therefore \quad & 108=(3)^2 \mathrm{R} \\ & \mathrm{R}=12 \Omega\end{array}\)
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