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MHT CET Physics question

PhysicsMoving Charges and MagnetismMHT CET

Equal current is flowing in three infinitely long wires along positive , and -directions. The magnetic field at a point would be

Answer: (A)

Solution

The point lies on the z-axis, so the z-wire gives zero; the x-wire gives and the y-wire gives (using $Missing argument for \vec\vec

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Question ID VK-078819