Magnetic Force on Moving Charges

Review - Like poles or Opposite Poles?

Dorling Kindersley Books

Like Poles

F) Magnetic Force on moving charges

A charge shot through
a magnetic field
experiences a magnetic force.

What is moving this beam of electrons?

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Physics 2000

Electron in Magnetic Field - Flash

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Scientific Advisors: Dr. Saul Dushman;
Dr. Roman Smoluchowski;
Dr. David Harker  Prelinger Archives
Production Company: Wolff (Raphael G.)
Studios, Inc. Audio/Visual: sound, color
Creative Commons license: Public Domain

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Force on a moving charge in a magnetic field is maximum when ...

a) .... the charge is Fast or Slow?

Fast

b) Big Charge or Small Charge?

Big

c) ... magnetic field strong or Weak?

Strong

1. F_mag = Bqv 

B - flux density of magnetic field (strength)

q - charge (C)

v - velocity (m/s)

Magnetic force is maximum
when charge moves
perpendicular to field

(Charge shot up)

Magnetic force = 0
when charge moves ...

... parallel to field

2. Direction of magnetic F on a charge moving through a magnetic field

Electron in Magnetic Field II - Flash

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Use 3rd Left Hand Rule

1) Draw in flux lines

2) Thumb - direction of moving charge

3) 4 fingers - direction of magnetic Field

4) Palm - direction of force on charge

Answer: Into or Out of the page?

Out of Page

Into page

Figure 2:

Into or Out of page?

Into Page

Left Hand Rule Game

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Helmholtz Coil

Mapping the direction of the Electromagnet

Finding the mass of an electron - Helmholtz Coil

Generator Principle

Enrichment

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Neodymium magnet/TV

magnetportal.de

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Warning: Doing this to your home TV
can permanently damage it!!