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Statement of a problem № 42310

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A small coil is introduced between the poles of an electromagnet so that its axis coincides with the magnetic field direction. The cross-sectional area of the coil is equal to S = 3.0 mm 2, the number of turns is N = 60. When the coil turns through 180° about its diameter, a ballistic galvanometer connected to the coil indicates a charge q = 4.5bC flowing through it. Find the magnetic induction magnitude between the poles provided the total resistance of the electric circuit equals R = 40Ω.




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