Imagine a heavy book resting on a table. If you try to gently push the book across the table with the tip of your finger, it ...

Listen to the full series on BBC Sounds. Charge is a property of a body which experiences a force in an electric field. Charge is measured in coulombs (C). Since electrons are so small and one ...

is a property of a body which experiences a force in an electric field. Charge is measured in coulombs (C). Since electrons are so small and one electron will not have much of an effect anywhere ...