This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: c. d F = Id s B Take the x-axis along the PC direction and the axis out of the page Id s = I e x dx B = B ext e z d F = Id s B = IdxB ext e y F = e y IB ext dx = a e y IB ext a I = / R = B ext a 2 2 R d dt F = e y B ext 2 a 3 2 R d dt C a. The direction of the current should be such as to oppose the change of the magnetic flux through the loop. Since the area decreases with time the direction of the current should drive a magnetic field along B ext (out of the page). As a result I is in the ccw direction as shown in the Figure. b. A = a 2 2 = a 2 2 d dt = d ( BA ) dt = Ba 2 2 d dt I y x F...
View Full Document