Science Common Sense

1691 - What is the principle behind the magnetic field produced by a long straight wire, circular coil, or long solenoid?

The magnetic field produced by a long straight wire, circular coil, or long solenoid is based on the principle that when electric current flows through a wire, it generates a magnetic field around it. This is known as the 'Right-Hand Rule'.

For a: - Long straight wire: If you hold your right-hand with your thumb in the direction of the current flow and your fingers will curl in the direction of the magnetic field.

• Circular coil: The magnetic field lines pass through the center of the coil and form a loop around it, resembling the shape of a doughnut.

• Long solenoid: It behaves like a bar magnet with the north and south poles at the ends, and the magnetic field lines run from the north pole to the south pole inside the solenoid.