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JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT

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Application +4 | -1

Two straight parallel wires carry currents of 

200\,\,{\mkern 1mu} mA\,\,{\mkern 1mu} \mathrm{and}\,\,\,{\mkern 1mu} 1A

in opposite directions. If the wires are 20 cm apart, the distance of the neutral point from the 

1A

wire is (in cm)

View answer and explanation

Correct option: D

25

Option A (5) is incorrect. Option B (15) is incorrect. Option C (20) is incorrect. Option D (25) is correct because the neutral point is located at a distance where the magnetic fields due to both wires cancel each other out. The distance from the smaller current wire is calculated, then added to the distance between the wires to find the distance from the 1A wire.

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