ICS Part 2 Physics Chapter 15 Short Questions Preparation

Question # 1

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 # 2

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 # 3

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 # 4

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 # 5

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 # 6

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 # 7

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 # 8

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 # 9

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 # 10

How can the power losses be minimized in a transformer?

Ans 1: The power can be minimized in transformer by implementing following considerations.
1. Core should be assembled from the laminated sheet of a material whose hysteresis loop are is very small.
2. The insulation between lamination sheets should be perfect so as to stop the flow of eddy current.
3. The resistance of the primary and secondary coils should be kept minimum.

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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

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?

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

What is back motor effect in generators?

Write two similarities and two difference between motor and generator.

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

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

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

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

How can the power losses be minimized in a transformer?

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

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?

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

What is back motor effect in generators?

Write two similarities and two difference between motor and generator.

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

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

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

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

How can the power losses be minimized in a transformer?

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

Name four methods to produce induce emf.

Define induced emf and induced current.

Define motional emf and write its formula.

What is back motor effect in generators?

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

What is back emf in motors?

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.

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

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

Can a transformer be used with D.C? Explain

Name the factor upon which the self inductance depends.

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.

Write two similarities and two difference between motor and generator.

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.

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.

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

What is DC motor?Write its principle.

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.

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

How can the power losses be minimized in a transformer?

Define induced emf and induced current.

Name the factor upon which the self inductance depends.

Define self induction and mutual induction.

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

How the power is lost due to eddy current in a transformer and how this loss can be minimized?

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 electromagnet?Mention two practical example of electromagnet.

Define self induction and also write its SI units.

Define mutual induction.

ICS Part 2 Physics Chapter 15 Short Questions Preparation

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