A circular coil (10 turns, diameter = 25 cm) is placed perpendicular to a uniform magnetic field (B = 2.7 x 10-3 T). If the direction of the magnetic field is reversed in 0.30s, what is the average emf induced in the coil?
1 Answer
May 19, 2018
Explanation:
Faraday's Law for induction in a coil:
mathcal E = - N(d Phi)/(d t)
And
implies mathcal E = - NA(d B)/(d t)
The question does not specify the manner in which the B-field is reversed wrt time - linear, sinusoid or something very different but smooth.
We can generalize:
-
B = B(t) -
B(0) = B_o -
B(0.3) = - B_o
For the average value of