Magnetic Force - (Physics 3)

Magnitude of a Magnetic Field equation

B = F/q(v)

B symbol

Magnetic field or the strength of the external magnetic field

F symbol

Magnetic force on a charged particle

q symbol

Magnitude of charge

v symbol

Speed of charge

SI unit of magnetic field strength

Tesla (T)

Magnetic fields of conventional laboratory magnets

1.5 T

Magnetic fields of superconducting magnets

As great as 30 T

Earth’s magnetic field near its surface in T

50 μT (5.0 × 10^-5 T)

Alternative right hand rule

Rule to find the direction of the magnetic force on a positive charge

Place your fingers in the direction of the magnetic field with your thumb pointing out in the direction of velocity; a positive charge is directed out of the palm of your hand

If the charge is negative,

The force is directed opposite from the alternative right hand rule

Force on a current-carrying conductor perpendicular to a magnetic field equation

F = B(I)(L)

I = current

L = length of conductor within B

Two current-carrying wires placed close together

Every magnetic forces on each other

When two conductors are parallel to each other,

The direction of the magnetic field created by one is perpendicular to the direction of the current of the other, and vise versa

Loudspeakers using magnetic forces

Magnetic forces acting on a current-carrying wire in a magnetic field to produce sound waves

Galvanometer

A device used in the construction of both ammeters and voltmeters

Galvanometer operation

Based on the fact that a torque acts on a current loop in the presence of a magnetic field

Ammeter

Used to measure currents

Voltmeters

Used to measure potential differences