PHYS1001 Lecture Notes - Lecture 9: Voltage Source

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13 Jun 2018

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Lecture 9- Magnetic Force

• Dipole—> two equal and opposite charges very closely separated 

◦ E.g. bar magnet 

◦ Fnet is small ones beings pulled and ones being pushed

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• When two magnets are close together they act more like monopoles 

• When the magnets are further apart they act more like dipoles 

Magnetic force

• Comes from moving charges 

• A charge which moves through an external magnetic field will experience a force



• The magnetic force is always at a right angle to the velocity of a charged particle 

• If a particle enters a magnetic field it will travel in a circle —> because of the force 

• If v and B are along the same axis Magnetic force =0 

• Include sign with charge 

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