T =? I = 0.3 A A horizontal, long current-carrying wire is hanging from a vertical thread. The current is oriented into the plane as shown above. A uniform magnetic field B = 0.4 T is applied along the negative x-axis. The wire has a length L = 80 cm, a mass m = 50 g and carries a current | = 0.3A. What is the value of the the tension in the string? %3D 0.2 N None of the other answers. 0.4 N 0.6 N ON

If a rectangular loop of wire is placed between the two poles poles of a magnet, with the dimensions w = 0.30 m and L = 1.2 m, and carries a current | = 3.0 A ( clockwise). The magnetic field due to the magnet is uniform and of magnitude 0.90 T. The loop rotates in the magnetic field. What is the magnitude of maximum torque acting on the wire due to the magnetic field? B WC N L A D O 0.40 N · m O 0.83 N · m O 0.48 N · m O 0.97 N · m O 0.88 N · m

A wire (mass = 50 g, length = 40 cm) is suspended horizontally by two %3D %3D vertical wires which conduct a current | = 9.7 A, as shown in the figure. The magnetic field in the region is into the paper and has a magnitude of 60 mT. What is the tension in either wire ( in units of N)? XX x X X X XX X X x X.X 40 cm

A current of 20.0 mA is maintained in a single circular loop with a circumference of 2.95 m. A magnetic field of 0.735 T is directed parallel to the plane of the loop. What is the magnitude of the torque exerted by the magnetic field on the loop? ? N · m