WBJEE 2021 Physics and Chemistry Solved Paper

Category III (Q36 to Q40)

Carry 2 marks each and one or more option (s) is/are correct. If all correct answers are not marked and also no incorrect answer is marked then score = 2 × number of correct answers marked  actual number of correct answers. If any wrong option is marked or if any combination including a wrong option is marked, the answer will be considered wrong, but there is no negative marking for the same and zero mark will be awarded.

Question : 40 of 80

Marks: +1, -0

A small bar magnet of dipole moment M is moving with speed v along x direction towards a small closed circular conducting loop of radius ' a ' with its centre O at x=0 (see figure). Assume x>>a and the coil has a resistance R. Then which of the following statemenmt(s) is/are true?

Magnetic field at the centre O of the circular coil due to the bar magnet is
M
x3
Induced EMF is proportional to
1
x4
The magnetic moment µ due to induced current in the coil is proportional to a4
The heat produced is proportional to
1
x6

Validate

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