Problem 4 A circular loop of wire with radiusR is in a uniform magnetic field with magnitude B that points in the positive z-direction. The loop is initially in the xy-plane and carries a constant, unknown current. Flipping the loop over requires you to do positive work (W). Determine the current in the loop.

if you already have the answer to (a), then just work out how many periods there are in 1 minute, and that's the answer to (c).

vapour or gas assuming atmospheriv pressure

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it