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Derive and expression for the force per ...

Derive and expression for the force per unit length acting on the two straight parallel current carrying conductors.In which condition will this force be attractive and repulsive?Define the standard unit of current.
OR
An electron is revolving with speed `v` in a circular orbit of radius `r`.Obtain the expession of gyromagnetic ratio.What is a Bohr magneton?Write its value.

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