ELECTROMAGNETIC INDUCTION
- Electromagnetic induction is the process by which electric current is generated in a conductor when it is placed in a changing magnetic field.
- In simple terms, when a magnet is moved relative to a coil (or vice versa), a current is induced in the coil. This phenomenon is called electromagnetic induction.
- Activity to Demonstrate Electromagnetic Induction:
Materials Required:
-
A bar magnet
- A coil of wire connected to a galvanometer (or sensitive ammeter)
Procedure:
- Take a coil of insulated copper wire and connect its ends to a galvanometer.
- Bring the north pole of a bar magnet near the coil — observe the galvanometer needle.
- Move the magnet toward the coil — the galvanometer needle deflects.
- Hold the magnet still — the needle returns to zero (no deflection).
- Now move the magnet away from the coil — the needle deflects in the opposite direction.
- Repeat the same by moving the coil instead of the magnet — similar results are observed.
Observation:
-
The galvanometer shows a deflection when there is relative motion between the magnet and the coil.
- The deflection reverses when the direction of motion is reversed.
- No deflection is seen when both are stationary.
No comments:
Post a Comment