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Q.

Two parallel long wires carry currents 18A and 3A. When the currents are in the same direction, the magnetic field at a point midway between the wire is B1. If the direction of i2 is reversed, the field becomes B2. Then the value of B1/B2 is

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a

7 : 5

b

5 : 3

c

3 : 5

d

5 : 7

answer is A.

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Detailed Solution

Question Image

B1=μ0×182πd2−μ032πd2
Question Image
=μ0×152πd2
B2=μ0182πd2+μ032πd2=μ0×212πd2;B1B2=57

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