Exercise 23 | A metal wire PQ of mass 10 g lies at rest on twohorizontal metal rails separated by

A metal wire PQ of mass 10 g lies at rest on two
horizontal metal rails separated by 4.90 cm (figure
34-E9). A vertically downward magnetic field of
magnitude 0.800 T exists in the space. The resistance
of the circuit is slowly decreased and it is found that
when the resistance goes below 20.0 , the wire PQ
starts sliding on the rails. Find the coefficient of friction.
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