A loop of wire sits in an external magnetic field as shown (in other words, the field shown in the picture is NOT a field created by the loop). If the induced current flows out of the top and into the bottom, how is the magnitude of the external field changing?
Impossible to tell unless we know vec B
The magnitude is constant
The magnitude is increasing
The magnitude is decreasing
The loop has a radius of 2.8 m. If the external magnetic field changes from 5 T to 10.5 T in 8.9 s, what is the magnitude of the induced emf in the loop?
1.52x10^1 V
1.38x10^1 V
4.84 V
1.09x10^1 V
2.91x10^1 V