A straight, long conductor is oriented north–south above a magnetic compass. A…
PHYSICS · Single correct · CBSE · Physics · Magnetic Effects of Electric Current · Magnetic Effects of Electric Current
Problem
A straight, long conductor is oriented north–south 2.0cm above a magnetic compass. A current of 3.0A flows from south to north through the wire. The horizontal component of the Earth’s magnetic field at the place is 3.0×10−5T toward geographic north. Assuming the field due to the wire is horizontal at the compass position, through what angle will the north pole of the compass needle deflect from geographic north, and toward which side will it turn?
(a) 30∘ toward the west of north
(b) 60∘ toward the west of north
(c) 45∘ toward the west of north
(d) 45∘ toward the east of north