A rectangular coil of wire has a dimensions of 4.9 cm by 9.7 cm and is wound with 84 turns of wire. It is turned between the pole faces of a horseshoe magnet that produces an approximately uniform field of 0.54T, so that sometimes the plane of the coil is perpendicular to the field and sometimes it is parallel to the field.

Question

Part A: What is the area bounded by the rectangular coil? Answer: 0.004753 m^2

Part B: What is the maximum value of the total magnetic flux that passes through the coil as it is turned? Answer: 0.215628 T*m^2

Part C: If the coil makes on complete turn each 0.5s and turns at a uniform rate, what is the time involved in changing the flux from the maximum value to the minimum value? Answer is in seconds.

Here's where I get lost I thought the answer was 42 s, but that wasn't correct, then maybe thought 84 s was the answer still wrong.