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A long solenoid of cross-sectional radiu...

A long solenoid of cross-sectional radius R has a thin insulated wire ring of uniform cross-section tightly put on its winding. The ring is made out of two different material such that one half of the ring has a resistance 10 times that of the other half. The magnetic induction produced by the solenoid varies with time as B = bt, where b is a constant. The magnitude of the electric field strength in the ring (other than the induced electric field) is

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