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

Write down any one method used for the production of induced emf.

  • Ans 1: Induced emf can be induced by electromagnetic induction.When a conductor is moved through a magnetic field the electric current flow through the circuit,The emf produced in the conductor is called induced emf and the current generated is called induced current.
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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

Write down any one method used for the production of induced emf.

  • Ans 1: Induced emf can be induced by electromagnetic induction.When a conductor is moved through a magnetic field the electric current flow through the circuit,The emf produced in the conductor is called induced emf and the current generated is called induced current.
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12th Class Physics Chapter 4 Short Questions Preparation - Set 2

Question # 1

Does the induced emf always act to decrease the magnetic flux through a circuit?

  • Ans 1: No.the induced emf always oppose the cause that produce it.If the magnetic flux through the circuit is increasing then induced emf acts to decrease the magnetic flux.
    it the magnetic flux through the circuit is decreasing,then induced emf acts to increase the magnetic flux.
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12th Class Physics Chapter 4 Short Questions Preparation - Set 3

Question # 1

Can step up transformer increase the power level?

  • Ans 1: No,a step up transformer can not increase the power level,in actual transformer,due of dissipation of energy in the coil the output power is always less than input power,Therefore a step up transformer can't increase power level.
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12th Class Physics Chapter 4 Short Questions Preparation - Set 4

Question # 1

When the primary of a transformer is connected to AC mains the current in it increase when secondary circuit is closed.Explain why?

  • Ans 1: When the secondary circuit is closed the output power increase.To produce the power ,transformer will draw large current from the A.C mains to increase its primary power.
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Physics
15th Chapter

12th Class Physics Ch 15 Preparation

Here you can prepare 12th Class Physics Chapter 15 (Electromagnetic induction test). Click the button for 100% free full practice .

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