The magnetic field at a point near a straight conductor has magnitude

MATHEMATICS · Single correct · CBSE · Mathematics · Proportional Reasoning-2 · Proportional Reasoning-2

Problem

The magnetic field at a point near a straight conductor has magnitude BB. Which single change will reduce this field to exactly 12B\dfrac{1}{2}B? (a) Double the current while keeping the distance unchanged (b) Halve the distance while keeping the current unchanged (c) Halve the current while keeping the distance unchanged (d) Double both the current and the distance

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