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A thin wire ring of radius a and resita...

A thin wire ring of radius a and resitance `r` is located inside a long solenoid is equal to `l`, its cross-sectional radius , to `b`. At a certain moment the solenoid was connected to a source of a constant voltage `V`. The total resistance of the circuit is equal to `R`. Assuming the the radial force acting per unit length of the ring.

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