What will cause a humming noise in radio?

* Electrical interference: Humming noise in radio can be caused by electrical interference from nearby electrical devices, such as lights, motors, or appliances. This type of interference is often referred to as electromagnetic interference (EMI) or radio frequency interference (RFI).

* Ground loop: A ground loop is a type of electrical circuit that occurs when two or more devices are connected to the same electrical outlet or power source, but they are not properly grounded. This can create a humming noise in radio.

* Faulty radio: If the radio itself is faulty, it may also produce a humming noise. This could be due to a number of factors, such as a damaged speaker, a loose connection, or a faulty power supply.