ICS Part 2 Physics Chapter 15 Short Questions Preparation

Question # 1

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 # 2

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 # 3

Write two similarities and two difference between motor and generator.

Ans 1: Similarities:
1. Construction of a motor is similar to a generator.
2. In both,magnetic field is provided by an electromagnet.
Differences:
1. Generators convert mechanical energy into electrical energy while motor converts electrical energy into mechanical energy.
2. In generator,the armature coil is rotated in the magnetic field and the current is the output.While in motor,armature is connected to battery,which rotated the armature.

Question # 4

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.

Ans 1: Yes,it the plane of the loop is kept parallel to the direction of the magnetic field magnetic flux through the coil will be zero,no emf will induced in the loop either by changing its area or by changing the magnetic field.

Question # 5

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.

Question # 6

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 # 7

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 # 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 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 # 10

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.

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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

Distinguished between AC generator and transformer.

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

Write two similarities and two difference between motor and generator.

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

Define motional emf and write its formula.

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

How can the power losses be minimized in a transformer?

Define mutual induction.

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

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

Distinguished between AC generator and transformer.

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

Write two similarities and two difference between motor and generator.

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

Define motional emf and write its formula.

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

How can the power losses be minimized in a transformer?

Define mutual induction.

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 2

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

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 is DC motor?Write its principle.

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 step up transformer increase the power level?

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

How can the power losses be minimized in a transformer?

What is mean by commutator in D.C generator?

Define self induction and mutual induction.

State the Lenz's law and define Henry.

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

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.

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

Define motional emf and write its formula.

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

Define induced emf and induced current.

Define self induction and mutual induction.

What is the working principle of transformer?Explain

What is mean by commutator in D.C generator?

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

Define the SI unit of mutual inductance.

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

Define self induction and mutual induction.

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

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

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.

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

What is the working principle of transformer?Explain

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

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

What is back motor effect in generators?

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

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