Silver is a valuable metal renowned and widely exploited for its electrical conductivity and aesthetic appeal.
However, silver does not depict magnetic properties associated with ferromagnetic metals. It is rather classified as a diamagnetic material.
Silver’s Interaction with Magnets
Silver uniquely interacts with magnetic materials. It is characteristically non-magnetic and its interaction with magnets is known as diamagnetism.
Whenever you bring a silver component like a silver coin close to a magnet, the coin will not be drawn towards the magnet.
In the face of superior magnets, your silver coin will fight off the magnetic forces emanating from the magnet’s magnetic field.
This results in repulsion. However, the repulsion effect of silver is relatively inferior to that of ferromagnetic metals like iron.
Relationship Between Silver’s Magnetism and Conductivity
Conductivity gauges the capability of specific substances to pass on electrical current.
Silver has mobile electrons and a unique atomic configuration, which are responsible for its superior conductivity. The relationship between silver’s high conductivity and its magnetic behavior is explained by the Lorentz force.
Lorentz Force in Silver
The Lorentz force depicts the relationship between charged particles and magnetic fields. Whenever you expose a silver object to a strong magnetic field, the path of its electrons will be deflected slightly. The volume of deflection will however be dependent on the power of the magnetic field lines.
Benefits of Silver’s Diamagnetic Features
Silver’s ability to weakly repulse magnetic field qualifies its use in distinct applications like magnetic levitation. Its diamagnetic properties bear the following rewards:
- Magnetic Shielding: Silver fights off external magnetic forces making it a perfect material for producing magnetic shields. You can use silver to deter magnetic interference in your electronics or other sensitive applications.
- Superior Conductivity: Silver is generally highly conductive and owing to its diamagnetic nature, it can be utilized to conduct electricity in settings prone to magnetic fields.
- Corrosion Tolerant: Silver is also highly resistant to rust and corrosion, making it the ideal material for settings prone to moisture.
How to Test Silver’s Magnetism
Scrutinizing the magnetic properties of silvers has always been employed to determine the purity and authenticity of silver. To determine the magnetic behavior of your silver object, follow the underlying steps:
- Assemble the Necessary Materials: Assemble a strong magnet, for instance, a permanent neodymium magnet and a silver object.
- Look for Impurities in the Silver: Examine the silver object to ensure that it is 100% pure and devoid of impurities like iron, which can influence the test results.
- Clean your Test Surface: Wipe clean the surface or area you intend to use for this experiment. This will eliminate interference from foreign elements.
- Undertake the Test: After cleaning the surface and assembling all necessary materials, hold the magnet in your hand and move it slowly towards the silver object. Avoid direct contact between the magnet and the silver object.
- Observe the Result: Keep an eye on the reaction of the silver object as you bring the magnet closer. If your object is made from 99.9% pure silver, it will not be drawn to the magnet. It will most likely repulse.
- Result Interpretation: If your object does not end up attracted to the magnet, this implies that you have pure silver. If it gets attracted, this might be an indication that your silver object contains traces of ferromagnetic materials or is fake.
Diamagnetic Applications of Silver
The diamagnetic properties of silver are often harnessed in varying industries to fulfill distinct roles. Here are the main real-life applications of diamagnetic silver.
- Magnetic Levitation: Magnetic levitation applications like maglev trains and product displays utilize the diamagnetic features of silver to keep objects afloat in mid-air.
- Frictionless Bearings: Silver is also broadly exploited to manufacture magnetic bearings that can operate without necessitating physical touch. These frictionless bearings facilitate the rotation of varying constituents within a system.
- Silver-Based MRI Contrast Agents: Employing silver in contrast agents for MRI machines improves the quality of scans generated. This enhances patient diagnostics.
- Energy Harvesting: The diamagnetic capabilities of silver have prompted its use in energy harvesting. It is being used to collect kinetic energy which ends up powering mobile devices like phones.
- Stabilizing Superconductors: Silver repels foreign magnetic fields and this eliminates friction during electricity transmission. As such, silver is utilized as a magnetic cushion in superconductors.
Silver has diamagnetic properties making it perfect for many applications as illustrated above.
More Resources:
Silver Melting Point – Source: HM
Silver Magnetism – Source: UMD