Q4 of 14 Page 58

Collect information regarding microphones which work under different physical principles.

Several different types of microphone are in use, which employ different methods to convert the air pressure variations of a sound wave to an electrical signal. The most common are the dynamic microphone, which uses a coil of wire suspended in a magnetic field; the condenser microphone, which uses the vibrating diaphragm as a capacitor plate, and the piezoelectric microphone, which uses a crystal of piezoelectric material. Some even operate on the principles of fiber optics.


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1

Make coils of a different number of turns using insulated copper wire. Use magnets of different strengths to produce induced emf. Present this activity in the science club.

 2

Michael Faraday, the father of electricity, did not even get elementary education. Are you not inspired by the achievements of Faraday in the field of science?

Conduct a seminar on “Contributions of Faraday and the hard work behind it.”

 3

Energy is invaluable, especially electrical energy. Society must be convinced of the necessity of reducing the consumption of electrical energy. Prepare and propagate posters for this purpose.

 5

Compare the induced current obtained when the armature coil rotates once in between the poles of a magnet, and the induced current obtained when the experiment using a magnet and coil was performed.