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Questions and Answers
What is the Curie temperature for iron?
What occurs when attempts are made to separate north and south poles in a magnet?
What is a consequence of lowering the temperature of ferromagnetic materials?
What happens to the magnetic properties of iron atoms at temperatures above the Curie temperature?
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What happens when a magnet is shrunk down to one iron atom?
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What type of force do permanent magnets exert?
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What happens when a permanent magnet is split?
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What is true about magnetic monopoles based on current understanding?
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Which statement best describes the nature of magnets?
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What could be a significant outcome if magnetic monopoles were discovered?
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Which equation represents the divergence of the electric field?
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What does the equation $∇×B = \mu_0 J + \mu_0 \epsilon_0 \frac{\partial E}{\partial t}$ signify in the context of electromagnetism?
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Which of the following topics is NOT included in the syllabus for PHY1032S?
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In the context of magnetism, what does 'spatial thinking' refer to?
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What is recommended as a strategy for success in the course?
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What is the proper method for submitting weekly problem sets?
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Which statement about alternating current (AC) circuits is true?
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What does the term 'compartmentalization of knowledge' imply in the study of physics?
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What does the torque on a magnetic dipole depend on?
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At which angle does the maximum torque occur for a magnetic dipole?
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What is the outcome when a coil rotates past the equilibrium at 0 degrees?
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How can the coil in an electric motor continue to rotate in the same direction?
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Which of the following describes the magnetic dipole moment?
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What happens to the torque on the dipole as it rotates towards an angle of 0 degrees?
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What is the unit of torque used in the context of magnetic dipoles?
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If the magnetic dipole moment is aligned perfectly with the magnetic field, what is the torque?
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What is the relationship between the magnetic force and the velocity of a charged particle?
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Which equation correctly represents the balance of magnetic and centripetal forces for a charged particle in circular motion?
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How is the radius of the circular path of a charged particle in a magnetic field determined?
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In the context of motion in a magnetic field, what component of velocity does not experience any force?
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What is the shape of the path taken by a charged particle moving in a magnetic field?
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Which term describes the motion characterized by the combination of parallel and perpendicular velocities in a magnetic field?
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What is the effect of increasing the charge (q) on the radius of the circular path described by a charged particle in a magnetic field?
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Which of the following factors does NOT affect the motion of a charged particle in a magnetic field?
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Study Notes
Magnetism
- Magnetism is a long-range force that can be attractive or repulsive.
- Magnets always have two poles: North and South.
- When a magnet is split, two smaller magnets remain.
- The force between magnets is not the same as the electric force.
- Magnetic forces do not affect stationary charged objects.
- Magnets are not electrically charged.
- Magnetic monopoles are hypothetical particles that have only a single magnetic pole (North or South), but no experimental evidence has been found.
Magnetic Dipole Moment
- The concept of a magnetic dipole moment (m) applies to bar magnets, solenoids, and loops.
- Torque on a dipole is given by: "τ = m × B"
- The torque on a dipole aligns the magnetic dipole moment with the magnetic field.
- The maximum torque is achieved when the angle between the magnetic dipole moment and the magnetic field is 90 degrees (sin θ = 1).
The Electric Motor
- Uses magnetic torque to produce continuous rotation.
- The torque on a coil reverses direction as the coil rotates past the equilibrium position (θ = 0).
- To ensure continuous rotation, brushes automatically reverse the current as the coil passes through θ = 0.
Charged Particle In a Magnetic Field
- The magnetic force is always perpendicular to the velocity of a charged particle moving in a magnetic field.
- This force causes a charged particle to move in a circular path whose radius depends on the particle's velocity, charge, and the magnetic field strength.
Motion of a Charged Particle in a Magnetic Field
- Charged particles in a magnetic field experience a force that causes them to follow a helical path.
- The particle moves in a circular path perpendicular to the magnetic field and with a constant velocity parallel to the magnetic field.
- The radius of the circular path is given by: "r = mv⊥ / qB"
Mass Spectrometer
- Uses magnetic fields to separate particles with different masses and charges.
- The motion of a charged particle in a magnetic field is determined by its charge (q), mass (m), and velocity (v).
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Description
Explore the fundamentals of magnetism, including the properties of magnets, magnetic dipole moments, and the functioning of electric motors. This quiz covers the key concepts surrounding magnetic forces and their applications in technology. Test your understanding of how magnetic torque influences rotation in devices like electric motors.