ICS Part 2 Physics Chapter 15 Short Questions Preparation

Question # 1

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 # 2

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 # 3

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

Ans 1: The ratio of average emf induced in the secondary to the time rate of changing current in the primary is called mutual inductance.
It depends upon numbers of turn of the coil,area of cross section of the coil closeness of coil and nature of the core materials.

Question # 4

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 # 5

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

Ans 1: Yes ,a D.C motor can be converted into D.C generator.For this armature of the motor is to be coupled with some rotating body.Due to rotation ,magnetic flux through the coil changes so and emf will be induced at the output.Hence the motor acts as a generator.

Question # 6

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.

Ans 1: If the secondary circuit is open then output power will be zero,Because output power is always slightly smaller than the input power,therefore a very small value of current is being drawn by a primary coil of transformer from AC units,

Question # 7

What is DC motor?Write its principle.

Ans 1: AD.c motor is a device which converts D.C electrical energy into mechanical energy.The basic principle of electric motor is that a current carrying coil placed in magnetic field experiences a torque which is given by t=NIAB cos theta.

Question # 8

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 # 9

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 # 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

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

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

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

How can the power losses be minimized in a transformer?

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

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.

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

Write two similarities and two difference between motor and generator.

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

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

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

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

How can the power losses be minimized in a transformer?

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

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.

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

Write two similarities and two difference between motor and generator.

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

Define self induction and also write its SI units.

State Faraday's law of electromagnetic induction.

Can step up transformer increase the power level?

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.

What is the working principle of transformer?Explain

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

Name the factor upon which the self inductance depends.

Define electromagnetic induction.

Define self induction and mutual induction.

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.

State Faraday's law of electromagnetic induction.

Define self induction and mutual induction.

Define self induction and also write its SI units.

What is electromagnet?Mention two practical example of electromagnet.

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

Name four methods to produce induce emf.

Can a transformer be used with D.C? Explain

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

A suspended magnet is oscillating freely in the horizontal plane.The oscillation are strongly damped when a metal plate is placed under,The magnet.Explain why its occurs.

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

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

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

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

Distinguished between AC generator and transformer.

Define mutual induction.

How can the power losses be minimized in a transformer?

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

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

Define self induction and also write its SI units.

Name four methods to produce induce emf.

ICS Part 2 Physics Chapter 15 Short Questions Preparation

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