ICS Part 2 Physics Chapter 15 Short Questions Preparation

Question # 1

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 # 2

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 # 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.

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 # 4

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 # 5

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

Ans 1: Yes the induced current depend upon the resistance of the circuit.
By ohm's law
I=e/R
Thus the induced current depends on the resistance of the circuit.

Question # 6

Define induced emf and induced current.

Ans 1: If a conductor moves through a magnetic field then due to change in magnetic flux,an emf is induced across the ends of the conductor which is known as back emf.If the circuit is close it will cause an electric current which is called as induced current.

Question # 7

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 # 8

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

Ans 1: The split rings are two halves of a ring that acts as commutator.When the current in the coil is zero and is about to change direction,the split ring also changes the contacts with the carbon brushes,Therefore the output remains the same direction although the current is not constantan magnitude.

Question # 9

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 # 10

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.

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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

Define the SI unit of mutual inductance.

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.

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

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

Define induced emf and induced current.

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

Name four methods to produce induce emf.

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 the SI unit of mutual inductance.

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.

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

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

Define induced emf and induced current.

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

Name four methods to produce induce emf.

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

Define motional emf and write its formula.

What is the working principle of transformer?Explain

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

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

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

Name four methods to produce induce emf.

Define induced emf and induced current.

Define electromagnetic induction.

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

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 - Set 3

What is back emf in motors?

Define mutual induction.

What is the working principle of transformer?Explain

Define the SI unit of mutual inductance.

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

State Faraday's law of electromagnetic induction.

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

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

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

Can a transformer be used with D.C? Explain

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

Write two similarities and two difference between motor and generator.

Distinguished between AC generator and transformer.

State the Lenz's law and define Henry.

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

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

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

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.

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

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

ICS Part 2 Physics Chapter 15 Short Questions Preparation

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