A rectangular coil consists of N = 100 closely wrapped turns and has dimensions a = 0.400 m and b = 0.300 m. The coil is hinged along the y axis, and its plane makes an angle e = 30.0° with the x axis (figure). a (a) What is the magnitude of the torque exerted on the coil by a uniform magnetic field B = 0.620 T directed in the positive x direction when the current is 1 = 1.20 A in the direction shown? N. m (b) If you are looking downward from the positive y direction, what is the expected direction of rotation of the coil? clockwise counterclockwise

A current of 30.0 mA is maintained in a single circular loop of 3.00 m circumference. A magnetic field of 0.850 T is directed parallel to the plane of the loop. (a) Calculate the magnetic moment of the loop. If you know the circumference of a circle, how do you find the area? mA · m2 (b) What is the magnitude of the torque exerted by the magnetic field on the loop? mN : m

A rectangular coil consists of N = 130 closely wrapped turns and has dimensions a = 0.400 m and b = 0.300 m. The coil is hinged along the y axis, and its plane makes an angle 0 = 30.0° with the x axis (figure). y B a (a) What is the magnitude of the torque exerted on the coil by a uniform magnetic field B = 0.510 T directed in the positive x direction when the current is I = 1.20 A in the direction shown? N. m (b) If you are looking downward from the positive y direction, what is the expected direction of rotation of the coil? O clockwise O counterclockwise

The figure below shows the cross section of a long conducting coaxial cable with a = 2.00 cm, b = 1.80 cm, and c = 0.40 cm. The inner conductor carries a current of I = 120 A that is uniformly distributed throughout its cross section and is going out of the page; the outer conductor also has the same current (uniformly distributed) but going into the page. Find the magnitude and direction (CW or CCW) of the magnetic fields at the following radii. (a) r = 3.00cm (b) r = 1.00cm (c) r = 1.90cm