A straight rod of mass m and lenth L is ...

A straight rod of mass m and lenth `L` is suspended from the identical spring as shown in the figure The spring stretched by a distance of `x_(0)` due to the weight of the wire The circuit has total resistance `R` When the magnetic field perpendicular to the plane of the paper is switched on, springs are observed to extend further by the same distance The magnetic field strength is

`(mg R_0)/(E )`

`(mg R_0) /( LE )`

`(mg R_0)/( 2LE)`

`(2mg R_0)/( 2LE)`

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