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

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 # 3

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 # 4

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 # 5

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 # 6

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 # 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

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 # 9

Define induced emf and induced current.

Ans 1: If a conductor moves through a magnetic field then due to change in magnetic flux,an emf is induced across the ends of the conductor which is known as back emf.If the circuit is close it will cause an electric current which is called as induced current.

Question # 10

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

Ans 1: When the secondary circuit is closed the output power increase.To produce the power ,transformer will draw large current from the A.C mains to increase its primary power.

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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.

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

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

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

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

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.

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

Define electromagnetic induction.

Define induced emf and induced current.

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

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.

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

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

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

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

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.

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

Define electromagnetic induction.

Define induced emf and induced current.

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

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

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

What is electromagnet?Mention two practical example of electromagnet.

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.

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

Can DC motor be turned into DC generator?What changes are required to be done?

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.

Define motional emf and write its formula.

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

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

What is mean by commutator in D.C generator?

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

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

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

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

What is back motor effect in generators?

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 AC mains the current in it increase when secondary circuit is closed.Explain why?

Differentiate between motor and generator.

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

Define motional emf and write its formula.

What is the working principle of transformer?Explain

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

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

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

Define self induction and mutual induction.

Define electromagnetic induction.

What is mean by commutator in D.C generator?

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

What is back motor effect in generators?

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.

State Faraday's law of electromagnetic induction.

What is DC motor?Write its principle.

ICS Part 2 Physics Chapter 15 Short Questions Preparation

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