Answer Happy

1) Two insulated wires, each 2.20 m long, are taped together to form a two-wire unit that is 2.20 m long. One wire carries a current of 7.00 A; the other carries a smaller current I in the opposite direction. The two wire unit is placed at an angle of 76.0° relative to a magnetic field whose magnitude is 0.360 T. The magnitude of the net magnetic force experienced by the two- wire unit is 3.13 N. What is the current I? A 2) Two coils have the same number of circular turns and carry the same current. Each rotates in a magnetic field as in the figure below. Coil 1 has a radius of 4.2 cm and rotates in a 0.15-T field. Coil 2 rotates in a 0.42-T field. Each coil experiences the same maximum torque. What is the radius (in cm) of coil 2? cm 3) A wire has a length of 4.00 x 102 m and is used to make a circular coil of one turn. There is a current of 2.90 A in the wire. In the presence of a 3.60-T magnetic field, what is the maximum torque that this coil can experience? N.m a 4) The rectangular loop in the drawing consists of 52 turns and carries a current of I = 2.6 A. A 1.6-T magnetic field is directed along the +y axis. The loop is free to rotate about the z axis. (0 = 23°)