Question 1: Define electromagnetic induction.

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

Question 2: Explain how a changing magnetic field induces a current in a coil of wire.

Answer: A changing magnetic field alters the magnetic flux through the coil, which induces an electromotive force (emf) according to Faraday's Law, resulting in a current.

Question 1: A coil with 200 turns is exposed to a magnetic flux change of 0.5 Weber over 2 seconds. Calculate the induced emf in the coil.

Answer: 50 V

Question 2: A magnet moves towards a coil at a speed of 0.3 m/s, with the coil's area being 0.01 m². If the magnetic flux linkage changes by 0.02 Weber per second, what is the induced emf?

Answer: 0.2 V

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

Answer: Move a magnet in and out of a coil connected to a galvanometer to observe deflections. Vary the speed of movement and note the changes in the galvanometer's needle to understand how flux change affects induced emf.

Question 2: Identify two variables that must be controlled during an induction experiment and explain why.

Answer: The speed of the magnet's movement and the number of turns in the coil; controlling these ensures consistent flux change and reliable results.

Question 1: A coil with 300 turns experiences a change in magnetic flux of 0.1 Weber over 5 seconds, producing an emf of 6 V. Analyse whether this data conforms to Faraday's Law.

Answer: Using Faraday's Law: emf = N * (ΔΦ / Δt). Calculated emf = 300 * (0.1 / 5) = 6 V, which matches the given emf, so it conforms.

Question 1: Describe how electromagnetic induction is used in the generation of electricity in power stations.

Answer: In power stations, turbines rotate coils within magnetic fields or magnets within coils to change magnetic flux, inducing an emf that generates electricity.

Question 2: Identify one advantage and one disadvantage of using electromagnetic induction in electrical transformers.

Answer: Advantage: Efficient voltage transformation; Disadvantage: Energy losses due to resistance and hysteresis.