Question

Please HELP!

A circular coil 18.0 cm in diameter and containing nine loops lies flat on the ground. The Earth's magnetic field at this location has magnitude 5.00×10−5T and points into the Earth at an angle of 59.0 ∘ below a line pointing due north. A 6.90-A clockwise current passes through the coil.

Part A

Determine the torque on the coil.

Express your answer using three significant figures and include the appropriate units.

T= ???

Part B

Which edge of the coil rises up: north, east, south, or west?

Answer 1

a) tau = N I A B sin theta = 9 times 6.90 times pi times 0.09^2 times 5.00 times 10^- 5 times sin 59 = 6.769 times 10^- 5 Nm b) The loop wants to align itself in the direction of magnetic field. Therefore north edge will rise