ICS Part 2 Physics Chapter 15 Short Questions Preparation

Question # 1

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 # 2

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 # 3

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 # 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

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

Ans 1: No an electron at rest can not be set in motion with a magnet because at rest electrons only have electric field which can not interfere with magnetic field to cause any force which can produce motion in electrons.

Question # 7

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 # 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 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 # 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

What is electromagnet?Mention two practical example of electromagnet.

Define self induction and mutual induction.

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

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

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

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

Define the SI unit of mutual inductance.

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

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

What is electromagnet?Mention two practical example of electromagnet.

Define self induction and mutual induction.

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

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

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

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

Define the SI unit of mutual inductance.

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

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

Write two similarities and two difference between motor and generator.

What is mean by commutator in D.C generator?

Differentiate between motor and generator.

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

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

Define the SI unit of mutual inductance.

Can step up transformer increase the power level?

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

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

Name four methods to produce induce emf.

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

Distinguished between AC generator and transformer.

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

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

Differentiate between motor and generator.

What is the working principle of transformer?Explain

Define the SI unit of mutual inductance.

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

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

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?

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

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

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

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.

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

Define self induction and mutual induction.

Name the factor upon which the self inductance depends.

Define self induction and also write its SI units.

State Faraday's law of electromagnetic induction.

ICS Part 2 Physics Chapter 15 Short Questions Preparation

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