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physics test 2

physics test 2 - Name of quantity symbol used Magnetic pole...

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Name of quantity, & symbol used What it measures units Something we saw or read about that serves as a quantitative example of this An equation that involves this An alternate set of units Magnetic pole, p strength of a magnet Amps times meters 0.1 Amp*meters is typical of electro- magnets we built; bar magnets might be 10 Amp*meters or more F = pB (C/s)* meter Magnetic field, B How space is changed by the presence of a magnet Tesla Earth’s magnetic field is about 0.00005 Tesla = 5E-5 Tesla U = B 2 *v/(8pk m ); U is energy of B-field , v is Volume Tesla = N/ (Amp*meter) Magnetic constant, k m How strong the magnetic force is vs. gravity and electricity N/Amp 2 k m =1x10 -7 N/Amp 2 ; text defines “mu-naught” = m 0 = 4pk m F mag = k m *p 1 *p 2 /r 2 N*sec 2 /C 2 Power, P Energy consumed per second Watts Light bulb 60 Watts, or typical horse can do about 746 Watts P=IV Joule/second Current, I Charge per second going past a point Amps Typical household objects use about 1 Amp I=V/R Coulomb per second Resistance, R How much an object resists
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