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The phase difference between the alternating current and emf is π/2. Which of the following cannot be the constituent of the circuit?
- R, L
- C alone
- L alone
- L, C
Correct answer: R, L
Solution
In a circuit where the phase difference between the alternating current and emf is π/2, the presence of resistance (R) would cause the current to be in phase with the voltage across it, which contradicts the specified phase difference. Therefore, a circuit containing both R and L cannot achieve a phase difference of π/2.
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