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If the extension in both the springs inc...

If the extension in both the springs increases from x to `x_0` on flowing current I in the rod from B to A then, the value of magnetic field will be -

A

`(mg)/(Pi)`

B

`(mgx)/(Pi)`

C

`(mgI)/(lx_0)`

D

`(mg(x_0-x))/(lix)`

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The correct Answer is:
D
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