A coil with a diameter d = 20 cm can rotate about a vertical axis coinciding with one of the diameters of the coil. The coil was installed in the plane of the magnetic meridian and a current of force I = 10 A was passed through it. What torque M must be applied to the coil to hold it in its initial position? The horizontal component of the induction of the Earth's magnetic field is taken equal to B = 20 µT.
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