Задача 30979.

The magnetic field is generated by a solenoid with a current of I1 = 100 mA and a straight long wire with a current of I2 = 50 A, located at a distance of 30 cm from the axis of the solenoid and perpendicular to this axis. The radius of the solenoid R = 20 cm, the winding density n = 5 cm ^ -1. At what distance from the axis of the solenoid is the nearest point at which the magnetic induction is zero?

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