Lenz's Law Video Lessons

Concept

# Problem: Five loops are formed of copper wire of the same gauge (cross-sectional area). Loops 1-4 are identical; Loop 5 has the same height as others but is longer. At the instant shown, all the loops are moving at the same speed in the directions indicated.There is a uniform magnetic field pointing out of the page in region I; in Region II there is no magnetic field. Ignore any interactions between the loops.A) For any loop that has an induced current, indicate the direction of the current.B) Rank the magnitude of the emfs around the loops. Explain your reasoning.C) Rank the magnitudes of the currents in the loops. Explain your reasoning.

###### FREE Expert Solution

A)

We can explain this using Lenz's law.

Loop 1 has a decreasing flux out of the page and so will induce a counterclockwise current to try and make up for that.

Loops 4 and 5 have increasing emf out of the page.

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###### Problem Details

Five loops are formed of copper wire of the same gauge (cross-sectional area). Loops 1-4 are identical; Loop 5 has the same height as others but is longer. At the instant shown, all the loops are moving at the same speed in the directions indicated.

There is a uniform magnetic field pointing out of the page in region I; in Region II there is no magnetic field. Ignore any interactions between the loops.

A) For any loop that has an induced current, indicate the direction of the current.

B) Rank the magnitude of the emfs around the loops. Explain your reasoning.

C) Rank the magnitudes of the currents in the loops. Explain your reasoning.