Question

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1.) A circular coil of wire of 50 turns and cross-sectional area 10.0 cm^2 carries a current of 4.0A. It is placed in a magnetic field of 2.0 T with the plane of the coil making an angle of 30^o with the magnetic field. What is the torque exerted on the coil by the field?
A) 0.7
B) 0.8
C) 0.4
D) 0.2

2.) Under what circumstances is the net magnetic flux through a closed surface negative?

A) The surface encloses either pole of a magnet as magnetic poles don't have signs like charges.
B) The surface encloses the north pole of a magnet as magnetic field lines point out of the north pole.
C) The magnetic flux through a closed surface is always zero.
D) The surface encloses the south pole of a magnet as magnetic field lines point into the south pole.
E) The surface encloses both the north and south poles of a magnet.

please explain in details thanks!!

Answer 1