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# JEE Class main Answered

find the acceleration
Asked by mohammedimroz | 13 Apr, 2024, 09:48: PM
Expert Answer

Induced emf due to changing magnetic field is given as,

E (2πR) = -AdB/dt = -πR2dB/dt

E = -RdB/2dt

Force on electron is

F = -Ee

F = -(eR)dB/2dt

Acceleration,

a = eRdB/2mdt

As the magnetic field increases at a constant rate and is directed into the paper, the current is induced

in the cylindrical surface in an anticlockwise direction. Hence, the force will be towards the left on the electron.

Thus, the correct option is option (a).

Answered by Shiwani Sawant | 17 Apr, 2024, 03:10: PM
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