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A wire carrying I and other carrying 2 I in the same direction produce a magnetic field B at the midpoint. What will be the field when 2 I wire is switched off? |
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Answer» Answer: 1) A WIRE CARRYING current I and other carrying 2I in the same direction produces a MAGNETIC field B at the mid point. What will be the field when 2I wire is switched off [AFMC 2005] A) B / 2 B) 2B C) B D) 48 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 \[B=\frac{{{\mu }_{0}}I}{2\pi r}\]. |
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