ICS Part 2 Physics Chapter 15 Short Questions Preparation

Question # 1

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.

Question # 2

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 # 3

State Faraday's law of electromagnetic induction.

Ans 1: It states that
"The average emf induced in a conducting coil of N loops is equal to the negative of the rate at which the magnetic flux through the coil is changing with time".

Question # 4

Distinguished between AC generator and transformer.

Ans 1: AC generator: AC generator is a device which produce AC voltage by converting mechanical energy into electrical energy.
Ans 2: Transformer: It is and electrical device which acts to change a given alternating emf into larger or smallar AC voltage.

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

Ans 1: The greater the load the larger the current is supplied by the generator,When the load resistance of the circuit is much less,small current is supplied by the generator.

Question # 7

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 # 8

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

Ans 1: Induced emf can be induced by electromagnetic induction.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.

Question # 9

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 # 10

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.

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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

Name four methods to produce induce emf.

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

State Faraday's law of electromagnetic induction.

Distinguished between AC generator and transformer.

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

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

Write two similarities and two difference between motor and generator.

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

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

What is back motor effect in generators?

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

Name four methods to produce induce emf.

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

State Faraday's law of electromagnetic induction.

Distinguished between AC generator and transformer.

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

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

Write two similarities and two difference between motor and generator.

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

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

What is back motor effect in generators?

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

Write two similarities and two difference between motor and generator.

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

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

Define induced emf and induced current.

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.

Can a transformer be used with D.C? Explain

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

Name four methods to produce induce emf.

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

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

What is back motor effect in generators?

Define mutual induction.

Distinguished between AC generator and transformer.

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.

Can a transformer be used with D.C? Explain

What is mean by commutator in D.C generator?

Name four methods to produce induce emf.

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

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

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 - Set 4

What is the working principle of transformer?Explain

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?

Define electromagnetic induction.

How can the power losses be minimized in a transformer?

What is mean by commutator in D.C generator?

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

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

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

ICS Part 2 Physics Chapter 15 Short Questions Preparation

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