Magnetism from Electricity - (Physics 3)

Induced magnetic field

A magnetic field generated in a material or circuit by a changing external magnetic field or a changing electric field

Right hand rule

A rule for conventional current

If the wire is grasped in the right hand with the thumb in the direction of the current, the four fingers will curl in the direction of the concentric circles around the wire

Concentric magnetic field

Consists of circular magnetic field lines that form around a straight, current-carrying wire

Solenoid

A long, helically wound coil of an insulted wire

The right hand rule can also be applied to

Finding the direction of the magnetic field of a current-carrying loop

Magnetic field strength inside of a solenoid

Increases with the current and is proportional to the number of coils per unit length

Magnetic field of a solenoid

Increased by inserting an iron rod through the center of the coil

Electromagnet

Devices made of coils of wire with electricity passing through them

Field lines of a solenoid

All point in the same direction, are nearly parallel, are uniformly spaces, and are close together

Solenoid applications

Most appliances in your home to very high-precision medical equipment