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