A long straight conductor is placed 5.0 cm east of a compass needle

PHYSICS · Single correct · CBSE · Physics · Magnetic Effects of Electric Current · Magnetic Effects of Electric Current

Problem

A long straight conductor is placed 5.0 cm east of a compass needle. The horizontal component of the Earth’s magnetic field at the location is 3.0×10−5 T3.0\times10^{-5}\,\text{T} directed toward geographic north. What current through the conductor, directed vertically upward, will produce a magnetic field of the same magnitude at the compass position? (a) 15 A15\,\text{A} (b) 7.5 A7.5\,\text{A} (c) 3.0 A3.0\,\text{A} (d) 1.5 A1.5\,\text{A}

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