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12th CBSE
IMPORTANT
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What are ferromagnetic substances? Explain briefly domain theory to explain ferromagnetism.

Important Questions on Magnetism

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12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 5 - Magnetism>Text Based Exercises>Q 35
Explain the phenomenon of hysteresis in magnetic materials. Draw a hysteresis loop showing remanence and coercive force.
EASY
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 5 - Magnetism>Text Based Exercises>Q 36
Define the terms retentivity and coercivity.
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12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 5 - Magnetism>Text Based Exercises>Q 37
In what way is the behaviour of a diamagnetic material different from that of a paramagnetic, when kept in an external magnetic field?
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12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 5 - Magnetism>Text Based Exercises>Q 38
Draw a hysteresis loop with axes labelled and showing remanence and coercive force. What does the area of the loop represent?
MEDIUM
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 5 - Magnetism>Text Based Exercises>Q 39
An electron of mass me revolves around a nucleus of charge +Ze. Show that it behaves like a tiny magnetic dipole. Hence prove that the magnetic moment associated with it is expressed as μ→=-e2 meL→ where L→ is the orbital angular momentum of the electron. Give the significance of negative sign.
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12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 5 - Magnetism>Text Based Exercises>Q 40
Permanent magnets are made of special alloys while the cores of temporary magnets are made of soft iron. Why?
EASY
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 5 - Magnetism>Text Based Exercises>Q 41
Depict the field-line pattern due to a current carrying solenoid of finite length. In what way do these lines differ from those due to an electric dipole?
EASY
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 5 - Magnetism>Text Based Exercises>Q 41
Depict the field-line pattern due to a current carrying solenoid of finite length. Why can't two magnetic field lines intersect each other?