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A metal rod of mass 10 gm and length 25c...

A metal rod of mass 10 gm and length 25cm is suspended on two springs as shown in the figure. The springs are extended by 4cm. When a 20 ampere current passes through the rod it rises by 1cm. The magnetic field is `"x " xx 10^(-2)T (g= 10m//s^2)` Find the value of 2x.

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