A horizontal copper rod of length 0.50m is suspended by two light insulating threads so that it can move vertically. The rod carries a current of 10A from west to east and is placed in a uniform magnetic field of magnitude 0.20T directed vertically downward.
a. (i) Determine the magnitude of the magnetic force acting on the rod.
b. (ii) The mass of the rod is 20g. Calculate the tension in each thread when the current is switched on, assuming the threads share the load equally.