Question

Explain the meaning of electromagnetic induction. Mention any two methods for producing induced current in a coil. State Fleming's right hand rule for finding the direction of induced current.

Hint:

When dealing with electromagnetic induction, always use Fleming’s right-hand rule to find the direction of the induced current in a conductor moving through a magnetic field.

Answer 1

Electromagnetic Induction:
Electromagnetic induction is the process of generating an electric current in a conductor by changing the magnetic field around it. This phenomenon was discovered by Michael Faraday in 1831. When a conductor (such as a coil of wire) moves through a magnetic field or when the magnetic field around the conductor changes, an electric current is induced in the conductor. The induced current can be produced by either of the following methods:
Methods of Producing Induced Current:
1.
Moving a Conductor Through a Magnetic Field:
When a conductor moves through a magnetic field, the magnetic flux through the conductor changes, which induces a current. The greater the speed of movement, the greater the induced current. 2.
Changing the Magnetic Field Around a Coil:
If a magnetic field around a stationary coil changes (e.g., by moving a magnet in and out of the coil or changing the strength of the magnetic field), a current is induced in the coil due to the change in magnetic flux.
Fleming's Right Hand Rule:
Fleming’s Right Hand Rule is used to determine the direction of the induced current when a conductor moves through a magnetic field. The rule states that: - Hold the right hand with the thumb, index, and middle fingers perpendicular to each other.
- The thumb represents the direction of the motion of the conductor (moving through the magnetic field).
- The index finger represents the direction of the magnetic field (from North to South).
- The middle finger represents the direction of the induced current in the conductor.

Conclusion:
Electromagnetic induction is an important principle in the generation of electric power. The methods of producing induced current, such as moving a conductor through a magnetic field or changing the magnetic field around a coil, form the basis for technologies like electric generators and transformers. Fleming's right-hand rule helps determine the direction of the induced current.