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  • Two parallel, long wires carry current i1 and i2 with i1 > i2. When the current is in the same direction, the magnetic field at a point midway between the wire is <img alt="10\mu T" src="ht

Two parallel, long wires carry current i1 and i2 with i1 > i2. When the current is in the same direction, the magnetic field at a point midway between the wire is 10\mu T. If the direction of i2 is reversed, the field becomes 30\mu T. The ratio of i1/ i2 is:

Option: 1

4


Option: 2

3


Option: 3

2


Option: 4

1


Answers (1)

best_answer

            B_{net} = \frac{\mu_{0} (i1 - i2)}{2\pi d} = 10 \mu T

\vec{B} = \frac{\mu_{0} (i1 + i2)}{2\pi d} = 30 \mu T

Solving both equations, we get:

                \frac{i1}{i2} = 2

Posted by

shivangi.bhatnagar

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