Given below are two statements: one is labelled as $\textbf{A}$ and the other is labelled as $\textbf{R}$…

Given below are two statements: one is labelled as $\textbf{A}$ and the other is labelled as $\textbf{R}$ $\textbf{A}$: A bar magnet dropped through a metallic cylindrical pipe takes more time to come down compared to a non-magnetic bar with same geometry and mass. $\textbf{R}$: For the magnetic bar, Eddy currents are produced in the metallic pipe which oppose the motion of the magnetic bar. In the light of the above statements, choose the correct answer from the options given below.
  1. A is false but R is true
  2. Both A and R are true and R is the correct explanation of A
  3. A is true but R is false
  4. Both A and R are true and R is NOT the correct explanation of A

Solution

Due to change in flux, eddy current is produced which opposes the motion in the metallic pipe for the bar magnet.

Eddy currents are loops of electrical current induced within conductors by a changing magnetic field in the conductor according to Faraday's law of induction. Eddy currents flow in closed loops within conductors, in planes perpendicular to the magnetic field.

Hence, R is the correct explanation and both statements are true.

Asked in: JEE Main 2023 (11 Apr Shift 2)

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