Online Preparation of Physics Chapter 15 For 12th Class Fsc

Online Short Questions For Chapter 4 "12th Class Physics Chapter 4 Short Questions Preparation "

Try The Short Questions For 12th Class Physics Chapter 4 Short Questions Preparation

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Physics - 12th Class Physics Chapter 4 Short Questions Preparation

Question # 1

Name four methods to produce induce emf.

  • Ans 1: An induce emf is produced in the loop if the magnetic flux through it changes.The methods to produce induced emf are:
    1. A bar magnet is moved towards the coil.
    2. By changing the area of the coil in a constant magnetic field.
    3. A coil of constant area is rotated in a constant magnetic field,
    4. The coil is placed in the magnetic field of an electromagnet.

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Prepare Complete Set Wise Questions For Chapter 4 "12th Class Physics Chapter 4 Short Questions Preparation "

12th Class Physics Chapter 4 Short Questions Preparation - Set 1

Question # 1

Name four methods to produce induce emf.

  • Ans 1: An induce emf is produced in the loop if the magnetic flux through it changes.The methods to produce induced emf are:
    1. A bar magnet is moved towards the coil.
    2. By changing the area of the coil in a constant magnetic field.
    3. A coil of constant area is rotated in a constant magnetic field,
    4. The coil is placed in the magnetic field of an electromagnet.

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12th Class Physics Chapter 4 Short Questions Preparation - Set 2

Question # 1

How can the power losses be minimized in a transformer?

  • Ans 1: The power can be minimized in transformer by implementing following considerations.
    1. Core should be assembled from the laminated sheet of a material whose hysteresis loop are is very small.
    2. The insulation between lamination sheets should be perfect so as to stop the flow of eddy current.
    3. The resistance of the primary and secondary coils should be kept minimum.
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12th Class Physics Chapter 4 Short Questions Preparation - Set 3

Question # 1

Distinguished between AC generator and transformer.

  • Ans 1: AC generator: AC generator is a device which produce AC voltage by converting mechanical energy into electrical energy.
  • Ans 2: Transformer: It is and electrical device which acts to change a given alternating emf into larger or smallar AC voltage.
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12th Class Physics Chapter 4 Short Questions Preparation - Set 4

Question # 1

A glass rod of "L"Length is moving perpendicular to the applied magnetic field P with velociety v.Explain briefly about the induced emf in it.

  • Ans 1: Induced emf is zero.As glass rod is insulator and there are no free electrons to be shifted from one extreme to the other.Therefore there will be no effect of perpendicular magnetic field.The induced emf is only produced by moving a conductor across the magnetic field.
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Physics
15th Chapter

12th Class Physics Ch 15 Preparation

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