Question 1: Electromagnetic induction occurs when a changing magnetic flux through a coil induces an electric current in the wire. This principle is fundamental to the operation of generators and transformers.

Answer: Electromagnetic induction is the process of generating an electric current by changing magnetic flux through a conductor.

Question 1: Define magnetic flux.

Answer: Magnetic flux is the measure of the magnetic field passing through a given area.

Question 2: Explain how moving a coil within a magnetic field induces an electric current.

Answer: When a coil moves within a magnetic field or the magnetic flux through the coil changes, an electromotive force (emf) is induced, causing an electric current to flow in the coil according to Faraday's Law.

Question 1: A coil with 200 turns is exposed to a changing magnetic flux that varies at a rate of 0.05 Weber per second. Calculate the induced emf in the coil.

Answer: Induced emf = N * (ΔΦ / Δt) = 200 * 0.05 = 10 Volts

Question 2: If the induced emf in a coil is 15 V and the number of turns is 300, what is the rate of change of magnetic flux through the coil?

Answer: Rate of change of flux = emf / N = 15 / 300 = 0.05 Weber per second

Question 1: Describe a simple experiment to demonstrate electromagnetic induction using a coil, a magnet, and a galvanometer.

Answer: Move a magnet quickly in and out of a coil connected to a galvanometer; the galvanometer needle deflects, showing induced current due to changing magnetic flux.

Question 2: Identify two variables that affect the magnitude of the induced emf in an induction experiment.

Answer: Speed of movement of the magnet and the strength of the magnetic field.

Question 1: A coil with 150 turns experiences a change in magnetic flux from 0 Weber to 0.3 Weber in 0.5 seconds. Calculate the average emf induced in the coil.

Answer: ΔΦ = 0.3 - 0 = 0.3 Weber; emf = N * (ΔΦ / Δt) = 150 * (0.3 / 0.5) = 150 * 0.6 = 90 Volts

Question 1: Explain how electromagnetic induction is utilized in the working of an electric generator.

Answer: In an electric generator, a coil is rotated within a magnetic field, changing the magnetic flux through the coil. This variation induces an emf, producing electric current that powers electrical devices.

Question 2: Name a device in daily life that uses electromagnetic induction and briefly describe its function.

Answer: Transformers use electromagnetic induction to change voltage levels in power transmission.