16 - Magnetic Fields --

16 - Magnetic Fields -- - PHYS FALL 2009 Magnetic Fields...

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PHYS FALL 2009 Magnetic Fields Magnetic Forces 9/30/09
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Summary When both electric and magnetic felds are present, a moving charge will Feel a combined Force. ! F = q ! E + q ! v " ! B This is known as the Lorentz ±orce ! F = q ! E ! F = q ! v " ! B
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Magnetic Force A positive charge enters a uniform magnetic ±eld as shown. What is the direction of the magnetic force? 1) out of the page 2) into the page 3) downwards 4) upwards 5) to the left
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Magnetic Force A positive charge enters a uniform magnetic ±eld as shown. What is the direction of the magnetic force? 1) out of the page 2) into the page 3) zero 4) to the right 5) to the left
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Example A uniform magnetic Feld B, with magnitude 1.2 mT is directed vertically upward throughout the volume of a laboratory chamber. A proton with kinetic energy 5.3 MeV enters the chamber, moving horizontally from south to north. What magnetic de±ecting force acts on the proton as it enters the chamber? ²rom the kinetic energy Fnd the velocity .
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16 - Magnetic Fields -- - PHYS FALL 2009 Magnetic Fields...

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