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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 `B_(1)`. If the direction of `i_(2)` is reversed, the field becomes `B_(2)`. Then the value of `B_(1)//B_(2)` is

A

`5:7 `

B

`7:5`

C

`3:5 `

D

`5:3`

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The correct Answer is:
A
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AAKASH SERIES-APPENDICES ( REVISION EXERCISE )-REVISION EXERCISE (MOVING CHANGES & MEGNETISM)
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