ICS Part 2 Physics Chapter 15 Short Questions Preparation

Question # 1

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 # 2

What is the working principle of transformer?Explain

Ans 1: The transformer work on the principle of mutual induction between two coils.The transformer consists of two coils of copper electrically insulated from each other,wound on the same iron core,The coil to which AC power is supplied is called primary and that from which power is delivered to the circuit is called secondary.

Question # 3

Define the SI unit of mutual inductance.

Ans 1: If current is changing at the rate of one ampere per second and the emf induced across the ends of the coil is one volt then inductance is called one Henry.Its SI units are VsA^-1.

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

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 # 6

Define mutual induction.

Ans 1: The phenomena in which the changing current in one coil induces an emd in another coil is called the mutual induction.

Question # 7

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

Ans 1: No,it is not possible.Because if it possible,it will be a self operating system without getting energy from some external source and this is against the law of conservation of energy.

Question # 8

How can the power losses be minimized in a transformer?

Ans 1: The power can be minimized in transformer by implementing following considerations.
1. Core should be assembled from the laminated sheet of a material whose hysteresis loop are is very small.
2. The insulation between lamination sheets should be perfect so as to stop the flow of eddy current.
3. The resistance of the primary and secondary coils should be kept minimum.

Question # 9

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 # 10

What is back motor effect in generators?

Ans 1: Back motor effect is the opposing torque produced due to the induced emf in the coil.When coil rotated a current is drawn through the coil.The magnetic field exerts two equal and opposite forces on left and right side of the current carrying coil,These forces are such that they produce a counter torque that oppose the rotational motion of the coil.This effect is known as back motor effect in generators.

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

Name four methods to produce induce emf.

What is the working principle of transformer?Explain

Define the SI unit of mutual inductance.

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

Define self induction and mutual induction.

Define mutual induction.

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

How can the power losses be minimized in a transformer?

Define motional emf and write its formula.

What is back motor effect in generators?

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

Name four methods to produce induce emf.

What is the working principle of transformer?Explain

Define the SI unit of mutual inductance.

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

Define self induction and mutual induction.

Define mutual induction.

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

How can the power losses be minimized in a transformer?

Define motional emf and write its formula.

What is back motor effect in generators?

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

Define self induction and mutual induction.

What is back motor effect in generators?

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.

Write two similarities and two difference between motor and generator.

State Faraday's law of electromagnetic induction.

Define mutual induction.

Define the SI unit of mutual inductance.

Differentiate between motor and generator.

What is electromagnet?Mention two practical example of electromagnet.

What is back emf in motors?

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

Write two similarities and two difference between motor and generator.

Name four methods to produce induce emf.

Distinguished between AC generator and transformer.

How can the power losses be minimized in a transformer?

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

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

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

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 meant by back emf?Write its SI units.

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

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

State Faraday's law of electromagnetic induction.

Define self induction and also write its SI units.

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.

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?

Name four methods to produce induce emf.

What is mean by commutator in D.C generator?

What is back emf in motors?

Define self induction and mutual induction.

Can step up transformer increase the power level?

ICS Part 2 Physics Chapter 15 Short Questions Preparation

Is this page helpful?

12th Class Physics
Short Questions Preparation