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FAQs on 12. Electromagnetic Induction - Theory Sheet, Class 12 Physics

1. What is electromagnetic induction?
Ans. Electromagnetic induction is the process of generating an electromotive force (emf) or voltage in a conductor when it is exposed to a changing magnetic field. This phenomenon was first discovered by Michael Faraday in the early 19th century.
2. How does electromagnetic induction work?
Ans. Electromagnetic induction works on the principle of Faraday's law of electromagnetic induction. According to this law, when a conductor is placed in a changing magnetic field, a voltage is induced across the conductor. This induced voltage can then cause an electric current to flow if the conductor is part of a closed circuit.
3. What are the applications of electromagnetic induction?
Ans. Electromagnetic induction has numerous practical applications. Some of the common applications include generators, transformers, induction cooktops, electric motors, magnetic levitation systems, and wireless charging. These technologies rely on the principles of electromagnetic induction to convert electrical energy into mechanical energy or vice versa.
4. What factors affect the magnitude of the induced voltage in electromagnetic induction?
Ans. The magnitude of the induced voltage in electromagnetic induction depends on several factors. These factors include the strength of the magnetic field, the rate at which the magnetic field changes, the angle between the magnetic field and the conductor, and the length and shape of the conductor. Generally, a stronger magnetic field, faster rate of change, and larger conductor area result in a higher induced voltage.
5. How does electromagnetic induction relate to Faraday's law and Lenz's law?
Ans. Electromagnetic induction is based on Faraday's law of electromagnetic induction and Lenz's law. Faraday's law states that the magnitude of the induced voltage is directly proportional to the rate of change of the magnetic field. Lenz's law, on the other hand, states that the induced current will always flow in a direction that opposes the change in the magnetic field that caused it. These laws play a crucial role in understanding and predicting the behavior of electromagnetic induction phenomena.
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