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A small bar magnet is being slowly inser...

A small bar magnet is being slowly inserted with constant velocity inside a solenoid as shown in figure. Which graph best represents the relationship between emf induced with time

A

B

C

D

Text Solution

Verified by Experts

The correct Answer is:
C
Initially `phi_(B)` increases as the magnet approaches the solenoid. Therefore, `epsilon` is negative and increases in magnitude when the magnet moves inside the solenoid. Increase in `phi_(B)` slows down and finally `phi_(B)` starts decreasing. Therefore e.m.f becomes positive and starts increasing. Only graph (c ) shows these characteristics. Also polarity of emf will charge when magnet starts coming out.
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