1. A square conducting loop with 1 turn of wire and sides of length a = 2
A square conducting loop with 1 turn of wire and sides of length a = 2.0 m is located in a region of uniform magnetic field of magnitude B = 2.5 mT. The current in the coil is I = 2.0 A. At the instant shown, both the plane of the coil and the direction of the magnetic field are in the plane of the paper, with the current flowing in the clockwise direction.
(a) Calculate the magnetic flux through the coil for the orientation shown in the figure.
B=2.5mT
I=2A
 A
a=2m

2. (b) If the coil is allowed to rotate about the vertical axis that bisects it (see the figure) what is the magnitude of the maximum torque exerted on the coil?
B=2.5mT
I=2A
 A
a=2m
Maximum value of sine is 1, when  is 90 or 270.
a/2
rotation axis