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Online Short Questions For Chapter 4 "ICS Part 2 Physics Chapter 15 Short Questions Preparation "

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Physics - ICS Part 2 Physics Chapter 15 Short Questions Preparation

Question # 1

Write two similarities and two difference between motor and generator.

  • Ans 1: Similarities:
    1. Construction of a motor is similar to a generator.
    2. In both,magnetic field is provided by an electromagnet.
    Differences:
    1. Generators convert mechanical energy into electrical energy while motor converts electrical energy into mechanical energy.
    2. In generator,the armature coil is rotated in the magnetic field and the current is the output.While in motor,armature is connected to battery,which rotated the armature.
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Prepare Complete Set Wise Questions For Chapter 4 "ICS Part 2 Physics Chapter 15 Short Questions Preparation "

ICS Part 2 Physics Chapter 15 Short Questions Preparation - Set 1

Question # 1

Write two similarities and two difference between motor and generator.

  • Ans 1: Similarities:
    1. Construction of a motor is similar to a generator.
    2. In both,magnetic field is provided by an electromagnet.
    Differences:
    1. Generators convert mechanical energy into electrical energy while motor converts electrical energy into mechanical energy.
    2. In generator,the armature coil is rotated in the magnetic field and the current is the output.While in motor,armature is connected to battery,which rotated the armature.
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ICS Part 2 Physics Chapter 15 Short Questions Preparation - Set 2

Question # 1

If area of the loop and magnetic field both are changing and still have no induced emf.Explain why?

  • Ans 1: If the plane of the loop is kept parallel to the direction of the magnetic field,magnetic field through the coil will be zero,no emf will be induced in the loop either by changing its are or by changing the magentic field.
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ICS Part 2 Physics Chapter 15 Short Questions Preparation - Set 3

Question # 1

What is back emf in motors?

  • Ans 1: When to coil motor rotates across the magnetic field by the applied potential difference V,an emf is induced in it.The induced emf is in such a direction that opposes the emf running motor.Due to this reasons,the induced emf is called back emf of the motor.The magnitude of the back emf increase with the speed of motor.
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ICS Part 2 Physics Chapter 15 Short Questions Preparation - Set 4

Question # 1

Define mutual inductance and write at least two factors at which it depends.

  • Ans 1: The ratio of average emf induced in the secondary to the time rate of changing current in the primary is called mutual inductance.
    It depends upon numbers of turn of the coil,area of cross section of the coil closeness of coil and nature of the core materials.
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