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For ferromagnetic material, the relative permeability μr versus the magnetic intensity H has the following shape.

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Important Questions on Magnetism

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JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 4 - Magnetism>Objective Problems [ Level 1 ]>Q 54
Two bar magnets of the same mass, length and breadth having magnetic moments M and 2M are joined together pole to pole and suspended in a vibration magnetometer. The time period of oscillation is 3 s. If now the polarity of one of the magnets is reversed, the time period of oscillation will be
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JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 4 - Magnetism>Objective Problems [ Level 1 ]>Q 55
All the magnetic materials lose their magnetic properties when
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JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 4 - Magnetism>Objective Problems [ Level 1 ]>Q 56
Which of the following is most suitable for the core of electromagnets?
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JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 4 - Magnetism>Objective Problems [ Level 1 ]>Q 57
At the magnetic North pole of the Earth, the values of the horizontal component H and the angle of dip θ are
HARD
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 4 - Magnetism>Objective Problems [ Level 1 ]>Q 58
A thin rectangular magnet suspended freely has a period of oscillation 4 s. If it is broken into two halves each having half their initial length, then when suspended similarly, the time period of oscillation of each part will be
EASY
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 4 - Magnetism>Objective Problems [ Level 1 ]>Q 59
The unit of pole strength is
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JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 4 - Magnetism>Objective Problems [ Level 1 ]>Q 60
Which of the following properties make soft iron the suitable for core of transformers?
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JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 4 - Magnetism>Objective Problems [ Level 1 ]>Q 61
When the magnetic inclination (dip) was measured at various places on the Earth, in one of the following countries it was found to be zero. Which one was it?