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Q.

Two long current carrying conductors are placed parallel to each other at a distance of 8 cm between them. The magnitude of magnetic field produced at mid-point between the two conductors due to current flowing in them is 300μT. The equal current flowing in the two conductors is:

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a

30A in the same direction.

b

30A in the opposite direction.

c

60A in the opposite direction.

d

300A in the opposite direction.

answer is B.

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Detailed Solution

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If currents are equal in both wires and field at mid-point is not zero, then the current is in opposite direction to sum up the fields at the point.

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BO=2μ0I2πr
2×4π×107I2π×4×102=3×104

I=30 A

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