A metal wireQ of mass 10 g lies at rest on two horizontal metal rails separated by 4.90 cm (fig...

A metal wireQ 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 Ω, the wire P Q starts sliding on the rails. Find the coefficient of friction.

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