Physics · Electromagnetic Induction
JEE Advanced 2020 — Paper 1 — Question 2
A light disc made of aluminium (a nonmagnetic material) is kept horizontally and is free to rotate about its axis as shown in the figure. A strong magnet is held vertically at a point above the disc away from its axis. On revolving the magnet about the axis of the disc, the disc will (figure is schematic and not drawn to scale)
- Option A:
rotate in the direction opposite to the direction of magnet's motion
- Option B:Correct
rotate in the same direction as the direction of magnet's motion
- Option C:
not rotate and its temperature will remain unchanged
- Option D:
not rotate but its temperature will slowly rise
Answer: B
Step-by-step solution
is decreasing, so clockwise current in the square loop is induced.
So force (along the arrow) is acting on the disc.
So movement of disc is along the direction of motion of magnet.
Answer key and solution verified before publishing.
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- Exam
- JEE Advanced 2020
- Paper
- Paper 1
- Subject
- Physics
- Chapter
- Electromagnetic Induction
- Topic
- Magnetic Flux, Faraday's Law and Lenz's Law