CBSE Class 12 Physics All Chapters Important Questions

CBSE Class 12 Physics All Chapters Important Questions. There are many more useful educational material which the students can download in pdf format and use them for studies. Study material like concept maps, important and sure shot question banks, quick to learn flash cards, flow charts, mind maps, teacher notes, important formulas, past examinations question bank, important concepts taught by teachers. Students can download these useful educational material free and use them to get better marks in examinations.  Also refer to other worksheets for the same chapter and other subjects too. Use them for better understanding of the subjects.

MAGNETIC EFFECT OF CURRENT AND MAGNETISM

1. WORK SHEET FOR LEVEL-A

Q.NO. WORK SHEET 1-A

NAME OF THE CHAPTER : MAGNETIC EFFECT OF CURRENT AND MAGNETISM

NAME OF THE TOPIC : MAGNETIC EFFECT OF CURRENT

1 State BiotSavart law giving the mathematical expression of it.

2 Write the expression for Lorentz magnetic force on a particle of charge ‘q’ moving with velocity ‘v’ in a magnetic field B.

3 Using the concept of force between two infinitely long parallel current carrying conductors, define one ampere current.

4 Write the expression for magnetic moment M due to planar square loop of side l carrying steady current I in a vector form.

5 State the underlying principle of cyclotron.

NAME OF THE CHAPTER : MAGNETIC EFFECT OF CURRENT AND MAGNETISM

NAME OF THE TOPIC : MAGNETISM 

1 The permeability of a magnetic material is 0.9983. Name the type of magnetic material it represents.

2 At what place on the surface of the earth, the angle of dip is 900 ?

3 The horizontal component of earth’s magnetic field at a place is B and the angle of dip is 600 . What is the vertical component of earth magnetic field at equator?

4 The susceptibility of a magnetic material is -2.6 x 10^-5. Identify the type of material.

5 Mention the two characteristic properties of the material suitable for making core of a transformer.

Q.NO. ANSWER

1 Diamagnetic substance

2 At south pole and north pole

3 Net magnetic field in vertical direction at the equator is zero.

4 Diamagnetic

5 Low coercivity and low retentivity.

                                                                                        1. WORK SHEET FOR LEVEL-C

Q.NO. WORK SHEET 1-C

NAME OF THE CHAPTER : MAGNETIC EFFECT OF CURRENT AND MAGNETISM

NAME OF THE TOPIC : MAGNETISM

1 What are permanent magnets? Give one example.

2 Draw diagrammatically the behavior of magnetic field lines in the presence of diamagnetic substance.

3 Give two factors by which voltage sensitivity of a MCG can be increased?

4 An electron is moving along X –axis in the presence of uniform magnetic field along + Y-axis. What is the direction of force acting on Z-axis?

5 Which one of the following will have the minimum frequency of revolution when projected with

the same velocity ‘v’ perpendicular to the magnetic field; i) α-particles ii) β-particles

Chapter-E.M.I and A.C

Worksheet1A                                                                                    

1 Define self-inductance.

2 Define mutual inductance.

3 What is the unit of self-inductance and mutual inductance?

4 Define magnetic flux.

5 What is the unit of magnetic flux?

                                                                                                             Answers-

1 The phenomenon of induction of e.m.f in a coil due to change in current or magnetic flux linked with the coil is called self-induction.

2 The phenomenon of induction of e.m.f. in a coil due to change in magnetic flux linked with a neighbouring coil is called mutual induction.

3 Henry or weber/ampere

4 Magnetic flux through a surface is the number of magnetic lines of force crossing the surface normally.

5 weber

Worksheet1B                                                                          Chapter-E.M.I and A.C

1 Define Eddy currents.

2 Write two applications of Eddy currents.

3 Plot agraph of inductive reactance vs. frequency of LCR series circuit. 

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