Magnetic Effects of Electric Current

1

Name the electric device that converts mechanical energy into electrical energy. Draw the labelled diagram and explain the principle involved in this device.

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2

With the help of a labelled circuit diagram wire describe an activity to illustrate the pattern of the magnetic field lines around a straight current carrying long conducting wire.

  1. Name the rule that is used to find the direction of magnetic field associated with a current carrying conductor.
  2. Is there a similar magnetic field produced around a thin beam of moving (a) alpha particles and (b) neutrons? Justify your answer.
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3

(a) What are magnetic field lines? How is the direction of magnetic field at a point in a magnetic field determined using field lines?

(b) Two circular coils ‘X’ and ‘Y’ are placed close to each other. If the current in the coil ‘X’ is changed, will some current be induced in the coil ‘Y’? Give reason.

(c) State ‘Fleming’s right hand rule”.

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4

Write the principle of working of an electric motor. Explain the function of the following parts of an electric motor:

  1. Armature
  2. Brushes
  3. Split ring
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5

State Fleming’s left hand rule.

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