Using a magnet on an electric appliance that's plugged in can have various effects, depending on the type of appliance and the strength of the magnet. Here are some possible scenarios:
No noticeable effect: For many common household appliances, such as laptops, smartphones, or televisions, the effects of a regular magnet will likely be negligible. The magnetic field of the appliance's internal components and the plug itself is designed to be shielded from external magnetic interference.
Temporary disruption or malfunction: In some cases, a strong magnet placed close to certain electronic components may cause temporary disruptions or malfunctions. This interference could result in distorted screens, audio glitches, or temporary loss of function. However, once the magnet is removed, the appliance should return to normal operation.
Permanent damage: Strong magnets, especially electromagnets, can potentially cause permanent damage to electronic devices. If a powerful magnet is brought too close to sensitive components, it can alter the alignment of magnetic fields, damage delicate circuitry, or corrupt data stored in magnetic media like hard drives.
Fire or electrical hazards: Using a magnet on an electric appliance can cause the appliance to overheat or short-circuit, leading to a potential fire hazard. This risk is higher if the magnet disrupts the flow of electricity or causes unexpected changes in electrical currents.
In general, it is not recommended to use magnets on plugged-in electric appliances, especially strong magnets. The potential risks of damaging the device or causing a hazardous situation outweigh any potential benefits. If you encounter an issue with an electric appliance, it is best to follow the manufacturer's guidelines and seek professional help if needed.