Question 1: Define electromagnetic induction.

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

Question 2: Explain how moving a magnet near a coil induces an electric current.

Answer: Moving a magnet near a coil changes the magnetic flux through the coil, which induces a voltage and causes a current to flow due to electromagnetic induction.

Question 3: Identify two key factors that affect the magnitude of the induced emf in a coil.

Answer: The speed of changing the magnetic flux and the number of turns in the coil.

Question 1: A coil with 200 turns experiences a change in magnetic flux of 0.02 Weber per second. Calculate the induced emf in the coil.

Answer: Induced emf = N * (ΔΦ/Δt) = 200 * 0.02 = 4 Volts

Question 2: If a current of 2 A is induced in a circuit with an emf of 4 V, what is the resistance of the circuit? Use Ohm’s law.

Answer: Resistance R = V / I = 4 V / 2 A = 2 Ohms

Question 1: Outline the steps involved in demonstrating electromagnetic induction using a coil and a moving magnet.

Answer: First, set up a coil connected to a galvanometer. Then, move a magnet rapidly towards and away from the coil. Observe the deflection of the galvanometer needle, which indicates induced current. Ensure safety by keeping hands clear of moving parts and handling magnets carefully to avoid pinches or injuries.

Question 2: Identify the variables that can be changed during the experiment and explain their effect on the induced emf.

Answer: Variables include the speed of magnet movement, the strength of the magnet, and the number of turns in the coil. Increasing the speed or magnet strength increases the induced emf; increasing the number of turns also increases the emf.

Question 1: A coil of 150 turns is subjected to a change in magnetic flux of 0.015 Weber over 0.5 seconds. Describe what happens to the coil and the current induced, and explain how increasing the number of turns would affect the induced emf.

Answer: The changing magnetic flux induces an emf in the coil, causing an electric current to flow. Increasing the number of turns would increase the total emf according to the formula emf = N * (ΔΦ/Δt), resulting in a stronger induced current.

Question 1: Explain the principle of electromagnetic induction and discuss two practical applications of this phenomenon in daily life or industry. Your answer should include relevant scientific explanations and examples.

Answer: Electromagnetic induction occurs when a changing magnetic flux through a conductor induces an emf, resulting in an electric current. This principle is used in transformers to change voltage levels and in electric generators to produce electricity in power stations, demonstrating its vital role in energy generation and distribution.

Question 1: Describe how electromagnetic induction is used in electric power generators and explain the importance of this application for society.

Answer: Electric power generators use electromagnetic induction by rotating coils within magnetic fields to produce electricity. This process is essential for supplying electricity to homes and industries, enabling modern life and economic development.