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MHT CET Physics question

PhysicsMoving Charges and MagnetismMHT CET

Two parallel long wires carry currents and with . When the currents are in the same direction, then the magnetic field at a point midway between the wires is T. If the direction of is reversed, then the field becomes T. The ratio is

Answer: (C)

Solution

With B at midpoint proportional to current: and (in T) give ,

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Question ID VK-078774