Question

A circular loop of wire of radius 0.25 cm is expected to an external magnetic field that is perpendicular to the plane of the loop. For a time, the magnetic field decreases at a rate of 0.0035 T/s. What is the magnitude of the induced electromagnetic force in the loop?

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Given:

Solution:

Answer 1

$F=SB\cos\alpha,\\ S=\pi r^2,~\alpha=0°,\\ F=\pi r^2 B=6.9\cdot 10^{-8}~N.$