A straight conductor of length carrying a current of is placed perpendicular to a…

MATHEMATICS · Single correct · ISC · Physics · Magnetic Effects of Current and Magnetism · Force on moving charges

Problem

A straight conductor of length 0.30 m0.30\,\text{m} carrying a current of 8 A8\,\text{A} is placed perpendicular to a uniform magnetic field of 0.40 T0.40\,\text{T}. The conductor is then rotated about its own axis until the magnetic force acting on it becomes exactly one-half of its initial value. Through how many degrees has the conductor been rotated? (a) 45∘45^{\circ} (b) 60∘60^{\circ} (c) 120∘120^{\circ} (d) 30∘30^{\circ}

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