First slide
Magnetic flux and induced emf
Question

A magnetic field of 2 × 10– 2 T acts at right angles to a coil of area 100 cm2 with 50 turns. The average emf induced in the coil is 0.1 V, when it is removed from the field in time t. The value of t is

Moderate
Solution

e=NB2B1AcosθΔt0.1=50×02×102×100×104×cos0tt=0.1sec.

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