ICS Part 2 Physics Chapter 15 Short Questions Preparation

Question # 1

Define mutual induction.

Ans 1: The phenomena in which the changing current in one coil induces an emd in another coil is called the mutual induction.

Question # 2

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 # 3

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 # 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

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 # 6

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

Ans 1: The emf induced across the ends of a coil due to the changing current in the same coil is called self induced emf or back emf.Its SI unit is Volt(V).

Question # 7

Define electromagnetic induction.

Ans 1: When a conductor is moved through a magnetic field,the electric current flow through the circuit,The emf produced in the conductor is called induced emf,and the current generated is called induced current.This phenomena is known as electromagnetic induction.

Question # 8

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 # 9

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 # 10

Differentiate between motor and generator.

Ans 1: Motor: A motor is a device which converts electrical energy into mechanical energy.
Ans 2: Generator: A generator is a device which convert mechanical energy into electrical 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

Define mutual induction.

What is back motor effect in generators?

Write two similarities and two difference between motor and generator.

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

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

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

Define electromagnetic induction.

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

What is electromagnet?Mention two practical example of electromagnet.

Differentiate between motor and generator.

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 mutual induction.

What is back motor effect in generators?

Write two similarities and two difference between motor and generator.

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

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

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

Define electromagnetic induction.

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

What is electromagnet?Mention two practical example of electromagnet.

Differentiate between motor and generator.

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

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 self induction and also write its SI units.

What is electromagnet?Mention two practical example of electromagnet.

State Faraday's law of electromagnetic induction.

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

How can the power losses be minimized in a transformer?

What is the working principle of transformer?Explain

What is mean by commutator in D.C 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.

Can a transformer be used with D.C? Explain

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

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

State the Lenz's law and define Henry.

What is mean by commutator in D.C generator?

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

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

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

Define mutual induction.

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

Define motional emf and write its formula.

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.

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

Differentiate between motor and generator.

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

What is back emf in motors?

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

Can a transformer be used with D.C? Explain

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

Name the factor upon which the self inductance depends.

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

Distinguished between AC generator and transformer.

Write two similarities and two difference between motor and generator.

ICS Part 2 Physics Chapter 15 Short Questions Preparation

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