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Plane figures made of thin wires of resi...

Plane figures made of thin wires of resistance `R=50` milliohm//metre are located in a uniform magnetic field perpendicular into the plane of the figures and which decrease at the rate `dB//dt=0.1 mT//s`. Then currents in the inner and outer boundary are. (The inner radius `a=10 cm` and outer radius `b=20cm)`

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