First slide

Magnetic flux and induced emf

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

Moderate

A
B
C
D

Solution

When loop is entering in the field, magnetic flux (i.e. x) linked with the loop increases so induced emf in it is $ε$ = Bvl
$= 0.6 \times 10^{- 2} \times 5 \times 10^{- 2} = 3 \times 10^{- 4} V (Negative)$
When loop completely entered in the field (after 5 sec) flux linked with the loop remains constant so $ε$ = 0.
After 15 sec, loop begins to exit out, linked magnetic flux decreases so induced emf is $ε$ = 3 x 10^-4V (Positive).

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