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Electromagnetism
i) Draw a neat and labelled diagram to show the structure of an a.c. generator.
ii) State the energy conversion taking place in the generator when it is working.
i) The labelled diagram of an a.c. generator is as shown below:
ii)
Mechanical energy is converted into electrical energy.
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On reversing the direction of the current in a wire, the magnetic field produced by it gets .....
i) Name the high energetic invisible electromagnetic waves which help in the study of the structure of crystals.
ii) State an additional use of the waves mentioned in part (e) (i)?i) Why does a current carrying, freely suspended solenoid rest along a particular direction? [2]
ii) State the direction in which it rests.You have been provided with a solenoid AB.
i) What is the polarity at end A.
ii) Give one advantage of an electromagnet over a permanent magnet.i) Draw a simple labelled diagram of a d.c. electric motor?
ii) What is the function of the split rings in a D.C motor?
iii) State one advantage of a.c. over d.c.?Name a common device that uses electromagnets.
Name two factors on which the magnitude of an induced e.m.f. in the secondry coil depends upon?
In the following diagram an arrow shows the motion of the coil towards the bar magnet.
1. State in which dirction the current flows, A to B or B to A?
2. Name the law used to come to the conclusion.i) What is an a.c. generator or dynamo used for?
ii) Name the principle on which it works?Sponsor Area
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