A Washer with Inner Diameter 5 $\circ$
B)19 ^$\circ$
C)85 ^$\circ$

A washer with inner diameter 5.0 cm is carried in your pocket as you walk directly north according to your magnetic compass.Assume the normal to the washer's plane is exactly horizontal,pointing toward magnetic north.The Earth's magnetic field strength is 0.056 mT.If the magnetic flux through the washer's opening is 36 nTm²,what is the angle below local horizontal that the magnetic field vector points?

A) 71 ^$\circ$
B) 19 ^$\circ$
C) 85 ^$\circ$
D) 4.7 ^$\circ$
E) None are correct.