A reminder about current

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Chapter 29 Magnetic Fields.

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Presentation transcript:

A reminder about current Electron current = drift speed of electrons n = density of electrons (number per unit volume) Conventional current i

Magnetic force on a current-carrying wire

Magnetic force on a current-carrying wire

Magnetic force on a current-carrying wire

Magnetic force on a current-carrying wire

Uniform magnetic field

Uniform magnetic field

Uniform magnetic field

Uniform magnetic field True for curved wires too.

Torque on a current loop

Side view: Net force is zero.

Net torque is not zero.

A magnetic dipole will align with the magnetic field.

N S N S

N S N S This is why magnets point north... as long as you are not too close to the poles.