physics test review question #4 help!~ 4. A uniform magnetic field B is perpendi

Question

physics test review question #4 help!~

4. A uniform magnetic field B is perpendicular to the plane of a rectangular conducting loop. One side of the rectangle is a wire that can slide so as to change the area of the loop. The field has a magnitude of 6T and an emfof3 volts is induced in the loop when the area of the loop is decreased at a constant rate from 0.6 m to 0.2 m [a] What was the time period during which the area decreased? [b] What is the significance of the negative sign in Faraday's Law?

Explanation / Answer

a)
induced emf = B*dA/dt

dt = emf/(B*dA)

= 3/(6*(0.6-0.2))

= 1.25 s

b) the negatice sign indicates the induced emf opposes the change in magnetic flux

by which it is genrated.

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