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Two parallel, long wires carry currents ...

Two parallel, long wires carry currents `i_1 and i_2` with `i_1gti_2`. When the currents are in the same direction, the magnetic field at a point midway between the wires is 10mu T. If the direction of `i_2` is reversed, the field becomes 30mu T . The ration` i_1/i_2` is

A

4

B

3

C

2

D

1

Text Solution

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The correct Answer is:
C
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