First slide
Magnetic flux and induced emf
Question

A 50 turns circular coil has a radius of  3 cm, it is kept in a magnetic field acting normal to the area of the coil. The magnetic field  B increased from 0.10 tesla to 0.35 tesla in 2 milliseconds. The average induced e.m.f. in the coil is

Moderate
Solution

e=NB2B1AcosθΔt=50(0.350.10)×π3×1022×cos02×103=17.7V

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