A circular loop of wire of radius 5cm lies in the plane of the page. There is magnetic pointing into the page increasing at a rate of 0.01T/s. This results in an EMF in the loop of:
a. 7.9 x 10-5 V in the clockwise direction looking into the page.
b. 7.9 x 10-5 V in the counter-clockwise direction looking into the page.
c. 0.01 V in the clockwise direction looking into the page.
d. 0.01 V in the counter-clockwise direction looking into the page.
Homework Answers
Induce emf = - change in flux/time
Flux = B.A
A= pi x r^2= 3.14 x 0.05 x 0.05= 0.00785m^2
Induced emf = 0.00785x 0.01= 7.85 x 10^-5 V
Direction = counter - clockwise
So option b
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