Electromagnetism: Solenoid and Magnetic Fields

A coil of wire with a length much greater than its diameter, creating a strong magnetic field within its central region. The direction of the field depends on the direction of the current flow through the coil.

The rule that states that if you curl your right hand fingers in the direction of the current flow in a solenoid, your thumb will point in the direction of the North pole of the solenoid.

The strength of the magnetic field within a solenoid is directly proportional to the current flowing through it and the number of loops per unit length of the coil.

The magnetic field within a solenoid is nearly uniform, meaning the field lines are parallel and equidistant in the central region of the solenoid.

To double the magnetic field strength in a solenoid without changing its dimensions, you need to double the current flowing through it.

To double the magnetic field strength in a solenoid without changing its dimensions, you need to double the number of loops per unit length of the solenoid.

To double the magnetic field strength in a solenoid without changing the current or the dimensions of the tube, you need to double the density of the turns (loops) per unit length by winding the solenoid more tightly.

To prevent overheating, a solenoid should be constructed with a thick wire of low resistivity. This allows for a greater current flow without generating excessive heat.