Solution to task 455 from Chertov´s for extramural stud

Solution to task 455 from Chertov´s for extramural stud

455. A square contour with a side a = 10 cm, in which a current I = 6 A flows, is in a magnetic field (B = 0.8 T) at an angle α = 50 ° to the induction lines. What work A needs to be done in order to change its shape to a circle with a constant current in the circuit?

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