A magnetic field of 0.45 g is directed straight down, perpendicular to the plane

Question

A magnetic field of 0.45 g is directed straight down, perpendicular to the plane of a circular coil of wire that is made up of 250 turns and has a radius of 20 cm. (a) if the coil is stretched, in a time of 15 ms, to a radius of 30 cm, calculate the emf induced in the coil during the process. (B) assuming the resistance of the coil is a constant 25 ohms, what is the induced current in the coil during the process.(c) what is the direction of the induced current in the coil (clockwise or counterclockwise)

Explanation / Answer

A) emf e = N*B*dA/dt = 250*0.45*10^-4*pi*(0.3^2-0.2^2)/15*10^-3 = 0.118 V...

B) i = e/R =0.118/25 = 4.713 mA..

C) according to lenz's law the current shold be in counter clockwise to ppose the increase of magnetic flux

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