Question 1: Define a microphone and explain its basic working principle based on the generator effect.

Answer: A microphone is a device that converts sound waves into electrical signals by using electromagnetic induction, where a diaphragm connected to a coil moves within a magnetic field, inducing a voltage.

Question 2: Describe how the movement of the diaphragm in a microphone results in an electrical signal.

Answer: The diaphragm vibrates in response to sound waves, causing the coil attached to it to move within a magnetic field, which induces a changing voltage due to electromagnetic induction.

Question 1: A microphone coil has 200 turns and is placed in a magnetic field of flux density 0.05 Tesla. If the coil moves such that the magnetic flux linkage changes by 0.01 Weber in 0.02 seconds, calculate the induced emf in the coil.

Answer: 0.5 volts

Question 2: If a coil with 150 turns experiences an emf of 0.3 V when the magnetic flux linkage changes by 0.015 Weber in 0.05 seconds, what is the rate of change of flux linkage per second?

Answer: 0.3 Weber per second

Question 1: Describe a simple experimental setup to demonstrate electromagnetic induction in a microphone coil. Include the variables you would change and safety precautions to consider.

Answer: A setup includes a coil of wire, a permanent magnet, a sound source (such as a speaker), and an oscilloscope or voltmeter. Variables include the magnetic field strength, coil turns, and coil movement. Safety precautions involve ensuring no exposed wiring, avoiding short circuits, and handling magnets carefully to prevent injury.

Question 1: A microphone in a recording studio is designed with 300 turns of wire in a magnetic field of 0.1 Tesla. When speaking, the coil experiences a change in magnetic flux linkage of 0.03 Weber in 0.01 seconds. Calculate the induced emf and explain how this affects sound recording quality.

Answer: Induced emf = (Number of turns × rate of change of flux linkage) = 300 × (0.03 / 0.01) = 900 volts. A higher emf improves the microphone’s sensitivity, leading to clearer sound recordings.

Question 1: Explain how electromagnetic induction is used in a microphone to convert sound waves into electrical signals. Your answer should include the role of the coil, magnetic field, and diaphragm.

Answer: Electromagnetic induction in a microphone occurs when sound waves cause the diaphragm and attached coil to vibrate within a magnetic field. As the coil moves relative to the magnetic flux, it experiences a change in magnetic flux linkage, inducing an emf. This emf varies with the sound wave’s vibrations, producing an electrical signal that replicates the sound.

Question 1: Identify and explain a real-world application of microphones that relies on electromagnetic induction, highlighting its importance in communication technology.

Answer: Microphones used in telephones and recording studios rely on electromagnetic induction to convert sound waves into electrical signals, enabling clear voice transmission and high-quality audio recordings.