2. The figure here depicts a long solenoid that contains two different magnetic materials. The materials on the left and right sides of the solenoid have permeabilities, and 2, respectively, and each has the same radius as the solenoid. Find the surface current densities (J1s and J2s) on each side of the solenoid that generate a uniform, axially directed B-field throughout the inside of the solenoid and no field outside. J₁5 J₁Sâ 2000000 J25= √25 ooooo

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Solenoids

A solenoid is a common term for a telephone coil used as an electromagnet. It also refers to any device that uses a solenoid to convert electrical energy into mechanical energy. The device generates a magnetic field from an electric field and uses the magnetic field to produce precise motion. Solenoid valves are often used to change power, such as in-car transmitters or valves, such as in the fuel system.