QJEEM23Ph64d8: JEE Main 2023 Physics - Class 12 JEEM23Ph64d8 Solution: Given below are two statements: one is labelled as Assertion A…
Given below are two statements: one is labelled as Assertion
Assertion 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.
Reason 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
Multiple Choice Options
- A A is false but R is true
- B A is true but R is false
- C Both A and R are true but R is NOT the correct explanation of A
- D Both A and R are true and R is the correct explanation of A
Step-by-Step Verified Solution
Assertion A is true because a bar magnet dropped through a metallic cylindrical pipe takes more time to come down compared to a non-magnetic bar with the same geometry and mass. This is due to the effect of the magnet's magnetic field on the metallic pipe.
Reason R is also true because when the magnetic bar moves through the metallic pipe, it induces a changing magnetic field in the pipe. This changing magnetic field, in turn, induces Eddy currents in the pipe. According to Lenz's law, these Eddy currents produce their own magnetic field, which opposes the motion of the magnetic bar, causing it to fall more slowly through the pipe.
Since both Assertion A and Reason R are true and R provides the correct explanation for A, the correct answer is Both A and R are true and R is the correct explanation of A.