Question

1. A 120-turn coil of resistance 3.20 ohms and cross sectional area 19.0 cm2 lies in the plane of the page. An external magnetic field of 0.900 T is directed out of the plane of the page. The external field decreases to 0.100 T in 11.5 milliseconds. What is the magnitude of the induced current (in Amperes) in the coil?

2. In Figure below, the two long straight wires are separated by a distance of d= 0.200 m. The currents are I1 = 6.50 A to the right in the upper wire and I2= 13.0 A to the left in the lower wire. What is the magnitude of the magnetic field in μT at point P, that is a distance d/2 below the lower wire?
(NOTE: μ0 = 4π × 10-7T ∙ m/A.)

Answer 1