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Two parallel long wires carry currents `i_(1)` and `i_(2)` with `i_(1) gt i_(2)` .When the current are in the same direction, the magnetic field at a point midway between the wire is `20muT`.If the direction of `i_(1)`,is reversed.the field becomes `30muT`.The ratio `i_(1)//i_(2)` is

A

4

B

3

C

5

D

1

Text Solution

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The correct Answer is:
C
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RESONANCE-ELECTRODYNAMICS-Exercise-1 PART-2
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