ICS Part 2 Physics Chapter 15 Short Questions Preparation

Question # 1

How does Lenz's law explain law of conservation of energy phenomena of electromagnetism induction?

Ans 1: When a rod is moving in the magnetic field towards right,an induced current flows through the loop in anticlockwise direction,Since current carrying rod experience a magnetic force opposite to that velociety.An external force equal in magnitude and opposite in direction must be applied to keep the rod moving with constant velocity.This dragging force provides the energy for the induced current to flow,This energy is the source of induced current.Thus electromagnetic induction is exactly according to law of conservation of energy.

Question # 2

Name the factor upon which the self inductance depends.

Ans 1: It depends upon induced emd and time rate of change of current in the coil.It also depend upon the number of turns of the coil,its area of cross section and the core material.

Question # 3

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.

Question # 4

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.

Question # 5

In a transformer there is no transfer of charge from the primary to the secondary.How is then the power transferred?

Ans 1: The power will be transferred because the two coils of transformer are magnetically linked i.e, the change of flux through one coil is linked with the other coil.

Question # 6

State the Lenz's law and define Henry.

Ans 1: Lenz's Law: It states that the direction of induced current is always so as to opposite the change which cause the current.
Henry: If the current in the primary is changing at the rate of one ampere per second and the emf induced across the ends of the secondary coil is one volt then the mutual inductance is called one henry.

Question # 7

Why is split ring is used in DC generators in place of slips rings?

Ans 1: The split rings are two halves of a ring that acts as commutator.When the current in the coil is zero and is about to change direction,the split ring also changes the contacts with the carbon brushes,Therefore the output remains the same direction although the current is not constantan magnitude.

Question # 8

Does the induced current depend on the resistance of the circuit?

Ans 1: Yes the induced current depend upon the resistance of the circuit.
By ohm's law
I=e/R
Thus the induced current depends on the resistance of the circuit.

Question # 9

Can a transformer be used with D.C? Explain

Ans 1: No As transformer works on the principle of electromagnetic induction,which is produced by A.C and not by D.C,To induced a voltage in the secondary coil it is necessary to have magnetic flux change.

Question # 10

Define self induction and also write its SI units.

Ans 1: The phenomena in which the changing current in a coil induce an emf in itself is called the self-induction.Its SI unit is VsA^-1.It is also called as henry(H).

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ICS Part 2 Physics Chapter 15 Short Questions Preparation

12th Class PhysicsShort Questions Preparation

12th Class Physics Chapter Wise Preparation

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

Physics - ICS Part 2 Physics Chapter 15 Short Questions Preparation

How does Lenz's law explain law of conservation of energy phenomena of electromagnetism induction?

Name the factor upon which the self inductance depends.

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

What is back emf in motors?

In a transformer there is no transfer of charge from the primary to the secondary.How is then the power transferred?

State the Lenz's law and define Henry.

Why is split ring is used in DC generators in place of slips rings?

Does the induced current depend on the resistance of the circuit?

Can a transformer be used with D.C? Explain

Define self induction and also write its SI units.

Prepare Complete Set Wise Questions For Chapter 4 "ICS Part 2 Physics Chapter 15 Short Questions Preparation "

Set 1

Set 2

Set 3

Set 4

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

How does Lenz's law explain law of conservation of energy phenomena of electromagnetism induction?

Name the factor upon which the self inductance depends.

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

What is back emf in motors?

In a transformer there is no transfer of charge from the primary to the secondary.How is then the power transferred?

State the Lenz's law and define Henry.

Why is split ring is used in DC generators in place of slips rings?

Does the induced current depend on the resistance of the circuit?

Can a transformer be used with D.C? Explain

Define self induction and also write its SI units.

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

What is mean by commutator in D.C generator?

Does the induced current depend on the resistance of the circuit?

What is meant by back emf?Write its SI units.

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.

Can an electron at rest be set in motion with magnet?Explain

What is the working principle of transformer?Explain

Define induced emf and induced current.

Is it possible to change both the area of the loop and magnetic field passing through the loop and still have bo induced emf in the loop?Explain briefly.

Name the factor upon which the self inductance depends.

State the Lenz's law and define Henry.

ICS Part 2 Physics Chapter 15 Short Questions Preparation - Set 3

Write two similarities and two difference between motor and generator.

State Faraday's law of electromagnetic induction.

What is back motor effect in generators?

Define mutual induction.

Name four methods to produce induce emf.

What is DC motor?Write its principle.

How can the power losses be minimized in a transformer?

Can an electric motor be used to derive and electric generator with output from the generator being used to operate the motor?

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

Define self induction and also write its SI units.

ICS Part 2 Physics Chapter 15 Short Questions Preparation - Set 4

State the Lenz's law and define Henry.

What changes are required to turn the D.C motor into D.C generators?

What changes are required to turn the D.C motors into a D.C generators?

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

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

Can step up transformer increase the power level?

Does the induced current depend on the resistance of the circuit?

In a transformer there is no transfer of charge from the primary to the secondary.How is then the power transferred?

Can DC motor be turned into DC generator?What changes are required to be done?

What is D.C motor?Write down part of D.C motor.

ICS Part 2 Physics Chapter 15 Short Questions Preparation

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