13.2 Lenz's Law

The minus sign made physical: an induced current always opposes the flux change that created it, fixing emf direction in coils and solenoids.

University Physics Volume 2, 13.2 Lenz's Law

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13.2 Exercise 8

A single-turn circular loop of wire of radius 50 mm lies in a plane perpendicular to a spatially uniform magnetic field. During a 0.10-s time interval, the magnitude of the field increases uniformly from 200 to 300 mT. (a) Determine the emf induced in the loop. (b) If the magnetic field is directed out of the page, what is the direction of the current induced in the loop?

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