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Unformatted text preview: rce and Field (Ch.29) 303L: Magnetic Force and Field (Ch.29) 1 Magnetic Fields and Forces Magnetic Fields and Forces Magnetic force Magnetic field • When a charged particle is moving through a magnetic field a magnetic • The right-hand rule • the magnitude of magnetic 1. Point the fingers of your right hand in field can be defined as force acts on it the direction of the velocity • We can describe the properties of the magnetic field B at some point
in terms of the magnetic force exerted on a test charge q moving at r
FB = q v × B that point with velocity v
• Experiments show 2. Curl the fingers in the direction of the
magnetic field, moving through the
smallest angle ⇓ 3. Your thumb is now pointing in the that the strength of the magnetic force on the particle is proportional to B= • magnitude of q r
FB = q v × B • magnitude of v
• strength of B F
qv sin θ direction of the magnetic force exerted on
a positive charge. • the SI unit of magnetic field
is tesla (T) • sine of the angle θ between v and B
1 T = 1 N/(Cm/s)=1 N/(Am) 303L:...
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