MATHEMATICS · Single correct · ISC · Mathematics · Physics · Magnetic Effects of Current and Magnetism
Problem
Two long parallel wires P and Q are 6 cm apart, with P lying to the east of Q. Both wires run along the north–south line. Wire P carries 8 A towards north, while wire Q carries 4 A towards north. Point R is exactly midway between the wires. The net magnetic field at R is directed
(a) vertically downward
(b) vertically upward
(c) zero (fields cancel)
(d) towards East