ICS Part 2 Physics Chapter 15 Short Questions Preparation

Question # 1

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 # 2

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 # 3

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 # 4

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

Ans 1: No.the induced emf always oppose the cause that produce it.If the magnetic flux through the circuit is increasing then induced emf acts to decrease the magnetic flux.
it the magnetic flux through the circuit is decreasing,then induced emf acts to increase the magnetic flux.

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

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

Ans 1: When the plane flies due north in the earth magnetic field directed vertical downward,then electron will experience force in east direction,Thus west wingtip of the plane is positively charged.

Question # 7

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 # 8

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 # 9

Can step up transformer increase the power level?

Ans 1: No,a step up transformer can not increase the power level,in actual transformer,due of dissipation of energy in the coil the output power is always less than input power,Therefore a step up transformer can't increase power level.

Question # 10

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.

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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

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.

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.

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

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

Define self induction and mutual induction.

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?

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

Can step up transformer increase the power level?

Define motional emf and write its formula.

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

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.

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.

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

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

Define self induction and mutual induction.

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?

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

Can step up transformer increase the power level?

Define motional emf and write its formula.

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

What is the working principle of transformer?Explain

State Faraday's law of electromagnetic induction.

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

Name four methods to produce induce emf.

Define motional emf and write its formula.

Differentiate between motor and generator.

Can a transformer be used with D.C? Explain

Distinguished between AC generator and transformer.

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.

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

Define the SI unit of mutual inductance.

Name four methods to produce induce emf.

Can step up transformer increase the power level?

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

What is mean by commutator in D.C generator?

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

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.

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.

Write down any one method used for the production of induced emf.

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

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

Define motional emf and write its formula.

State Faraday's law of electromagnetic induction.

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

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.

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

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

Name the factor upon which the self inductance depends.

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

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

ICS Part 2 Physics Chapter 15 Short Questions Preparation

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