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Two parallel wires of length 9 m each ar...

Two parallel wires of length `9 m` each are separated by a distance `0.15 m` .If they carry equal currents in the same direction and exerts a total force of `30xx10^(-7)N` on each other, then the value of current must be

A

2.5 amp

B

3.5 amp

C

1.5 amp

D

0.5 amp

Text Solution

Verified by Experts

The correct Answer is:
D
`F = ((mu_(0) I^2)/(2pi d)) implies I = sqrt((F xx 2pi d)/(mu_(0) xx l))`
`implies I = sqrt((30 xx 10^(-7) xx 0.15)/(2 xx 10^(-7) xx 9)) = 0.5A`
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