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Two parallel conductors carry current in opposite direction as shown in figure. One conductor carries a current of 10.0 A. point C is a distance `d/2` to the right of the 10.0 A current. If the d=18 cm and l is adjusted so that the magnetic field at C is zero, the value of the current l is

A

40 A

B

30 A

C

20 A

D

`10 A `

Text Solution

Verified by Experts

The correct Answer is:
B
`B_(1) = B_(2) implies (mu_(0) I_(1))/(2pi r_(1)) = (mu_(0) I_(2))/(2pi (r_(1) + d)) implies (10)/(5) = (I)/(15) = I = 30A`
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