Question

Two infinite, thin, staright wires 10 m apart carry currents. The distance between the two wires where the net magnetic field is zero is

• A. 0.25 m
• B. 0.2 m
• C. 0.33 m
• D. can not say

Answer 1

The correct option is D can not say

Given: Distance between wires is 10 m

Solution: formulae used in the question is :

$F=\frac{{\mu }_0{i}_1{i}_2}{2\pi r}$

$F=i(l\times B)$

But the value of i is not given so, we can not say when the net magnetic field is zero .

Hence the correct answer is D