ICS Part 2 Physics Chapter 15 Short Questions Preparation

Question # 1

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 # 2

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.

Question # 3

In a certain region the earth's magnetic field points vertically down,When a plane flies due north,which wing tip is positively charged?

Ans 1: When the plane flies due north in the earth magnetic field directed vertical downward,then electron will experience force in east direction,Thus west wingtip of the plane is positively charged.

Question # 4

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 # 5

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 # 6

State Faraday's law of electromagnetic induction.

Ans 1: It states that
"The average emf induced in a conducting coil of N loops is equal to the negative of the rate at which the magnetic flux through the coil is changing with time".

Question # 7

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.

Question # 8

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

Ans 1: The emf induced across the ends of a coil due to the changing current in the same coil is called self induced emf or back emf.Its SI unit is Volt(V).

Question # 9

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 # 10

How the power is lost due to eddy current in a transformer and how this loss can be minimized?

Ans 1: The induced currents that are set up in the core of transformer in the direction perpendicular to the flux are known as eddy currents,It results in power dissipation and heating of the coral material.The insulation between lamination sheets should be perfect so as to stop the flow of eddy currents.

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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

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

Name four methods to produce induce emf.

In a certain region the earth's magnetic field points vertically down,When a plane flies due north,which wing tip is positively charged?

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

Can a transformer be used with D.C? Explain

State Faraday's law of electromagnetic induction.

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

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

Name the factor upon which the self inductance depends.

How the power is lost due to eddy current in a transformer and how this loss can be minimized?

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

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

Name four methods to produce induce emf.

In a certain region the earth's magnetic field points vertically down,When a plane flies due north,which wing tip is positively charged?

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

Can a transformer be used with D.C? Explain

State Faraday's law of electromagnetic induction.

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

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

Name the factor upon which the self inductance depends.

How the power is lost due to eddy current in a transformer and how this loss can be minimized?

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

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

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

State the Lenz's law and define Henry.

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

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

Differentiate between motor and generator.

State Faraday's law of electromagnetic induction.

What is back emf in motors?

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.

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

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

When the primary of a transformer is connected to A.C mains,the current it is very small if the secondary circuit is open.Explain.

What is DC motor?Write its principle.

State Faraday's law of electromagnetic induction.

What is back emf in motors?

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

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

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

Can a transformer be used with D.C? Explain

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

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

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

What is back motor effect in generators?

How can the power losses be minimized in a transformer?

Define self induction and mutual induction.

Define mutual induction.

What is back emf in motors?

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

How the power is lost due to eddy current in a transformer and how this loss can be minimized?

Can step up transformer increase the power level?

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.

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

ICS Part 2 Physics Chapter 15 Short Questions Preparation

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