ICS Part 2 Physics Chapter 15 Short Questions Preparation

Question # 1

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 # 2

What is electromagnet?Mention two practical example of electromagnet.

Ans 1: When a specimen of iron is placed inside a current carrying solenoid,it becomes and electromagnet.Examples are
1. Transformers
2. Motors

Question # 3

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

Ans 1:
1. In order to convert to convert DC motor into SC 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 # 4

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 # 5

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.

Question # 6

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 # 7

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 # 8

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.

Ans 1: The oscillating magnet produces change of magnetic flux close to it.The metal plate placed below it experiences the change the magnetic flux,As the result eddy currents are produced inside the metal.According to Lenz's law these eddy currents oppose the cause which produce it,So the oscillation of magnet are strongly damped.

Question # 9

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 # 10

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.

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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

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

What is electromagnet?Mention two practical example of electromagnet.

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

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

What is back motor effect in generators?

Define the SI unit of mutual inductance.

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

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.

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

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

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

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

What is electromagnet?Mention two practical example of electromagnet.

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

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

What is back motor effect in generators?

Define the SI unit of mutual inductance.

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

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.

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

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 2

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

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.

Define self induction and mutual induction.

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?

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

Name four methods to produce induce emf.

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 the Lenz's law and define Henry.

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

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

Define self induction and also write its SI units.

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

Define electromagnetic induction.

What is back emf in motors?

Name four methods to produce induce emf.

Name the factor upon which the self inductance depends.

Define induced emf and induced current.

What is electromagnet?Mention two practical example of electromagnet.

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

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

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

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 back motor effect in generators?

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

Differentiate between motor and generator.

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 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?

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.

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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