Question

What is a solenoid ? Draw the magnetic lines of force around a current carrying solenoid. Also throw some light on the use of solenoid.

Answer 1

The solenoid is a long cylindrical coil of wire consisting of a large no. of turns bound together very tightly. Note: The length of the coil should be longer than its diameter. (Or) Solenoid is a coil of a number of turns of insulated copper wire closely wrapped in shape of a cylinder. Magnetic field around a current carrying solenoid is as shown in the figure. These appear to be similar to that of a bar magnet. One end of the solenoid behaves like North Pole and the other end behaves like the South Pole. Magnetic field lines inside the solenoid are in the form of parallel straight lines. This means that the field is same at all the points inside the solenoid. When soft iron rod is placed inside the solenoid, it behaves like an electro magnet. The use of soft iron as core in the solenoid produces the strongest magnetism.

Used of Solenoid:-

1. A solenoid is used to control a valve electrically, for example, the solenoid core is used to apply mechanical force to the valve.

2. These can also used in particular types of door locking systems, which use an electromagnet and offer a very secure closure.

3. The solenoid is used in many different appliances and products like computer printers, fuel injection gear used on cars and in various industrial settings.

4. The main advantage of the solenoid is, whenever an electricity is applied, the reaction of the solenoid is immediate.

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Answer 2

A solenoid is a coil of a large number of circular turns of wire wrapped in the shape of a cylinder. On passing electric current, a magnetic field is developed along the axis of solenoid.

They can be used to slow the flow of electricity in a circuit, making them an example of an inductor, or an impedance device. Cars also have a type of solenoid that is really just a motor that happens to work using a coil of wire. The job of the solenoid is to turn electrical energy into movement.