A, B and C are parallel conductors of equal length carrying currents I, I and 2I, respectively. Distance between A and B is x. Distance between B and C is also x. F1 is the force exerted by B on A and F2 is the force exerted by C on A. Choose the correct option.

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F1 = 2F2

F2 = 2F1

F1 = F2

F1 =−F2

answer is D.

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Detailed Solution

F=μ04π = 2I1 I2a× lF1=μ04π = 2I2x× l AttractionF2=μ04π × 2× I × 2I2x× l = μ04π × 2I2x RepulsionThus F1=−F2

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