SOLENOID?(CBSE XTH PHYSICS)

 

A solenoid is basically a coil of wire, usually wound in a cylindrical shape, that creates a magnetic field when an electric current passes through it.

Think of it as "an electromagnet in a tube"—but with the added twist that it can also produce motion if paired with a movable core.

SOLENOID

Key Points

• Structure: A long wire wound into many loops (often around a metal core).

• Function: Converts electrical energy into a magnetic field.

• Magnetic effect: The field inside is strong and uniform; outside, it’s weaker.

• Types:

  • Electromagnetic solenoid: Used to generate a controlled magnetic field.

  • Electromechanical solenoid: Uses the magnetic field to move a plunger or core (used in door locks, valves, relays).

• Applications

  • Car starters

  • Electric door locks

  • MRI machines

  • Automatic water valves

  • Loudspeakers