MCQEasyJEE Main 2025 · 29 January, Shift 1Alternating Current Basics

Physics Question from JEE Main 2025 · 29 January, Shift 1

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Choke coil is simply a coil having a large inductance but a small resistance. Choke coils are used with fluorescent mercury-tube fittings. If household electric power is directly connected to a mercury tube, the tube will be damaged. Reason (R): By using the choke coil, the voltage across the tube is reduced by a factor RR2+ω2L2\frac{R}{\sqrt{R^2 + \omega^2 L^2}}, where ω\omega is the frequency of the supply across resistor RR and inductor LL. If the choke coil were not used, the voltage across the resistor would be the same as the applied voltage. In light of the above statements, choose the most appropriate answer from the options given below:

  • A

    Both (A) and (R) are true and (R) is the correct explanation of (A)

  • B

    (A) is false but (R) is true

  • C

    Both (A) and (R) are true but (R) is not the correct explanation of (A)

  • D

    (A) is true but (R) is false

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