A) \[B/2\]
B) \[2B\]
C) \[B\]
D) \[4B\]
Correct Answer: C
Solution :
When two parallel conductors carrying current \[I\]and \[2I\] in the same direction, then magnetic field at the mid-point is \[B=\frac{{{\mu }_{0}}2I}{2\pi r}-\frac{{{\mu }_{0}}I}{2\pi r}=\frac{{{\mu }_{0}}I}{2\pi r}\] When current \[2I\] is switched off then magnetic field due to conductor carrying current \[I\] is\[B=\frac{{{\mu }_{0}}I}{2\pi r}\]. Hence, option is correct.You need to login to perform this action.
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