ICS Part 2 Physics Chapter 15 Short Questions Preparation

Question # 1

Define motional emf and write its formula.

Ans 1: If a conductor moves through a magnetic field then due to change in magnet flux,an emf is induced across the ends of the conductor which is known as motional emf.
e=vBL sin theta.

Question # 2

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.

Question # 3

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 # 4

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 # 5

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

Ans 1:
1. In order to convert DC motor into DC generator the magnetic field must be supplied by the permanent magnet and not by electromagnet.
2. An arrangement to rotate the coil armature should be provided and battery must be removed.

Question # 6

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 # 7

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

Ans 1: D.C motor is a device which converts electrical energy into mechanical energy.Main part of D.C motor are commutator ,armature and permanent magnet or electromagnet.

Question # 8

Define self induction and mutual induction.

Ans 1: The phenomena in which changing current in a coil induced a emf in itself is called self-induction.
The phenomena in which changing current in one coil induces an emf in another coil is called mutual induction.

Question # 9

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 # 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.

Latest Educational News Stories

Pakistan's Largest Database of Colleges and Universities

BS Programs

University Past Papers

University Results

Exam Results 2024

Study Abroad Programs and Opportunities for Pakistani Students

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

Define motional emf and write its formula.

Distinguished between AC generator and transformer.

Can a transformer be used with D.C? Explain

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

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

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

Define self induction and mutual induction.

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

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

Define motional emf and write its formula.

Distinguished between AC generator and transformer.

Can a transformer be used with D.C? Explain

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

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

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

Define self induction and mutual induction.

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

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 self induction and mutual induction.

What is back emf in motors?

How can the power losses be minimized in a transformer?

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

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

What is back motor effect in generators?

What is mean by commutator in D.C generator?

Define the SI unit of mutual inductance.

Define induced emf and induced current.

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

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

Define self induction and also write its SI units.

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

What happen to the current of a circuit if a load resistance of the circuit is much less than the power transferred?

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

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

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

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

Define the SI unit of mutual inductance.

Can a transformer be used with D.C? Explain

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

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

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

Can a transformer be used with D.C? Explain

Differentiate between motor and generator.

Distinguished between AC generator and transformer.

How can the power losses be minimized in a transformer?

What is electromagnet?Mention two practical example of electromagnet.

Write two similarities and two difference between motor and generator.

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?

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.

ICS Part 2 Physics Chapter 15 Short Questions Preparation

Is this page helpful?

Share your comments & questions here

12th Class Physics
Short Questions Preparation