MHT CET 2025 Physics question

Physics Alternating Current MHT CET 2025

An a.c. source of frequency 'f' is connected to a circuit containing an inductance 'L' and resistance 'R' in series. The impedance of this circuit is

(A)
(B)
(C)
(D)Correct

Answer: (D)

Solution

In a series LR circuit the voltage across the inductor leads the current by while the voltage across R is in phase with it, so the impedances add as phasors at right angles: with . Hence

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Question ID VK-102651