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Questions and Answers
What is the primary reason that diamagnetic materials are repelled by a magnet?
What is the primary reason that diamagnetic materials are repelled by a magnet?
According to Lenz's Law, what happens when a current loop is placed in an external magnetic field?
According to Lenz's Law, what happens when a current loop is placed in an external magnetic field?
How do filled electron orbits contribute to the behavior of diamagnetic materials?
How do filled electron orbits contribute to the behavior of diamagnetic materials?
What effect does bringing a diamagnetic material into a stronger part of a magnetic field have?
What effect does bringing a diamagnetic material into a stronger part of a magnetic field have?
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In which scenario is the magnetic moment of a current loop increased?
In which scenario is the magnetic moment of a current loop increased?
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Study Notes
Diamagnetism
- Diamagnetic materials have no net magnetic dipole moment when not in an external magnetic field
- When placed in an external magnetic field, they experience a weak repulsive force
- Orbiting electrons create a current loop; an induced current opposes the change in magnetic field
- The induced magnetic moment opposes the external magnetic field
- This results in a weak repulsive force
- The effect is small and only noticeable in strong magnetic fields
Paramagnetism
- Materials with unpaired electrons have a net magnetic dipole moment
- In the absence of an external magnetic field, the magnetic moments are randomly oriented
- Application of an external field aligns the magnetic moments along the field, increasing the net magnetic moment
- The alignment is weak; removing the field results in random reorientation
- These materials are weakly attracted towards external magnetic fields
Ferromagnetism
- Materials with strong attraction to external magnetic fields
- Unpaired electrons have aligned magnetic moments
- Interactions between neighboring moments create strong, spontaneous magnetization
- Presence of magnetic domains
- Alignment of domains results in stronger magnetism
Induced Current in Current Loop
- When a current loop is placed in an external magnetic field, an induced current is produced
- The direction of the induced current is such that its magnetic field opposes the change in the external magnetic field (Lenz's Law)
- For one loop, the induced current aligns with the loop current, increasing the net magnetic moment
- For the other loop, induced current is opposite to loop current, reducing net magnetic moment
Diamagnetic Materials Examples
- Values in the table show the susceptibility (χ) of some materials in the presence of an external magnetic field (X 10⁻⁵)
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Description
Test your knowledge on different types of magnetism, including diamagnetism, paramagnetism, and ferromagnetism. This quiz will explore key characteristics, behaviors under external magnetic fields, and the fundamental principles that govern these magnetic phenomena.
