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A long solenoid of cross-sectional ra...

A long solenoid of cross-sectional radius `a` has a thin insulates wire ring tightly put on its winding, one half of the ring has the resistance `eta` times that of the other half. The magnetic induction produced by the solenoid varies with the time as `B = bt`, where `b` is a constant. Find the magnitude of the electric field strength in the ring.

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