Question

# A square loop of side 5 cm enters a magnetic field with 1 cms^{-1}. The front edge enters the magnetic field at t = 0 then which graph best depicts emf

## The correct answer is:

### When loop is entering in the field, magnetic flux (i.e. ´) linked with the loop increases so induced emf in it = (Negative) .

When loop completely entered in the field (after 5 sec) flux linked with the loop remains constant so e = 0.

After 15 sec, loop begins to exit out, linked magnetic flux decreases so induced emf (Positive)

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