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Question
Which of the following are the possible ways to increase the induced e.m.f. produced by a simple A.C. generator?
I. Increasing the rotating speed of the coils
II. Placing a soft iron core in the coil
III. Replacing the permanent magnets with another pair of magnets having stronger magnetic field strength.
Which of the following are the possible ways to increase the induced e.m.f. produced by a simple A.C. generator?
I. Increasing the rotating speed of the coils
II. Placing a soft iron core in the coil
III. Replacing the permanent magnets with another pair of magnets having stronger magnetic field strength.
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Solution
The correct option is D I, II and III
The given three ways increase the rate of change of magnetic field lines through the cross-section of the conductor linked with the circuit.
Increasing the speed of the coil in accordance to the Faraday’s law increases the rate at which the coil cuts the magnetic field lines, which would produce greater magnitude of emf.
Placing a soft iron core enhance the magnetic field and magnetic field is directly proportional to the emf generated by the AC generator.
Thus, option D is the correct answer.
The given three ways increase the rate of change of magnetic field lines through the cross-section of the conductor linked with the circuit.
Increasing the speed of the coil in accordance to the Faraday’s law increases the rate at which the coil cuts the magnetic field lines, which would produce greater magnitude of emf.
Placing a soft iron core enhance the magnetic field and magnetic field is directly proportional to the emf generated by the AC generator.
Thus, option D is the correct answer.
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