Challenge question: A rectangular circuit ABCD with resistance R moves away from a wire with current I at a speed v, while the side AB remains parallel to the wire. The lenght of the sides AB and BC are respectively 2a 2b. How much current flows through the circuit when the distance between the wire and the circuit is r? (Denote the magnetic permeability by μ0). The magnetic flux created by the circuit is negligible.

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