Question

(Figure 1) shows a 14-cm-diameter loop in three different magnetic fields. The loop's resistance is 0.20 Ω .

Part A
For case (a), what is the induced emf?
Express your answer with the appropriate units.

Part B
For case (a), what is the induced current?
Express your answer with the appropriate units.

Part C
For case (a), what is the direction of the current?

(a) B increasing at 0.50 T/s (b) B decreasing at 0.50 T/s (c) B decreasing at 0.50 T/s хах X X х х X хбx X X X X

Answer 1

a) the induce emf :
ε = dφ/dt = A*dB/dt

= π*0.07^2*0.5

= 7.7 x10^-3 V

B)

the induced current :
I = ε/R = 38.5 x10^-3 A

C)
Lenz's rule=> direction : clockwise for case (a)