NEET2017Physics-Magnetism
NEET 2017 Physics Magnetic Force MCQ Question
Type: MCQ-conceptual-Medium-Class 12
An arrangement of three parallel straight wires placed perpendicular to plane of paper carrying same current ‘I’ along the same direction is shown in figure. Magnitude of force per unit length on the middle wire ‘B’ is given by
A
μ₀I² / 2πd
B
2μ₀I² / πd
C
πd / √2μ₀I²
D
μ₀I² / √2πd
Correct Answer
Option D
Detailed Explanation
The force per unit length between two parallel wires carrying current I is given by F/L = μ₀I² / 2πd. For the middle wire, the forces due to the other two wires add up.
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