A long solenoid with radius 2 cm carries a current of 2A. The solenoid is 70 cm long and is composed of 300 turns of wire. Calculate flux linked with a circular surface if it has radius greater than 2 cm and-axis of solenoid subtends an angle of 60° with the normal to the area (the centre of circular surface being on the axis of solenoid).

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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.