A short bar-magnet placed with its axis making an angle θ with a uniform magnetic field B → experienced a torque τ → . What is the magnitude of the magnetic moment of the magnet?

Using the expression for the torque experienced by a small bar magnet when placed in uniform magnetic field, 𝜏 = m → × B → = mBsinθ Therefore, we get m = 𝜏 Bsinθ

E M B I B E

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 9 - Magnetic Field and Earth's Magnetism>QUESTIONS>Q 4

MEDIUM

12th ICSE

IMPORTANT

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Write an expression for the potential energy of a magnet in a uniform magnetic field. When is the magnet in stable and unstable equilibrium?

Important Questions on Magnetic Field and Earth's Magnetism

MEDIUM

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 9 - Magnetic Field and Earth's Magnetism>QUESTIONS>Q 5

Give the position of a magnet held in a magnetic field when its potential energy is minimum.

EASY

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 9 - Magnetic Field and Earth's Magnetism>QUESTIONS>Q 6

Write down the formula for the magnitude of the magnetic field due to a small bar-magnet at a point in the end-on position. Write the meanings of the symbols used.

EASY

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 9 - Magnetic Field and Earth's Magnetism>QUESTIONS>Q 7

Write an expression, explaining the meanings of symbols, for the magnitude of the magnetic field due to a small bar-magnet at a point in the broad-side-on position.

EASY

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 9 - Magnetic Field and Earth's Magnetism>QUESTIONS>Q 8

Does the magnetic axis of a freely-suspended magnet exactly point in the geographic north-south direction?

EASY

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 9 - Magnetic Field and Earth's Magnetism>QUESTIONS>Q 9

Write the relation connecting the angle of dip, horizontal and vertical components of magnetic field of earth at a place.

EASY

12th ICSE