You are designing a small coil (called a search coil) to measure magnetic fields. It is to have a diameter of 3.60 cm and is to be designed so that flipping it 180 degrees in a field of 9.00×10-2 T causes a maximum total charge of 0.400 mC to flow through a charge-measuring instrument of resistance 54.0 ohm
How many turns should the coil have?