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31_Ch 19 College Physics ProblemCH19 Magnetism

# 31_Ch 19 College Physics ProblemCH19 Magnetism - Magnetism...

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Magnetism 171 Thus, the downward magnetic force acting on the wire is () ( ) 23 2 19.6 N m 0.80 10 m 10.0 10 kg 9.80 m s 5.9 10 N m total Fk x m g −− =− × sin90 m 2 Since the magnetic force is given by F BIL = ° , the magnetic field is ( )( ) 2 2 12 5.9 10 N 0.59 T 24 V 5.0 10 m mm FF B IL V R L Ω× == = = × 19.67 Each turn of wire occupies a length of the solenoid equal to the diameter of the wire. Thus, the number of turns on the solenoid is 75.0 cm 750 0.100 cm solenoid wire L N d = The length of wire required to make this number of turns on the solenoid is ( ) ( ) ( ) 2 750 10.0 10 m 75.0 m solenoid id N d ππ = × N circumference of soleno l π = and this copper wire has a resistance of ( ) 8 Cu Cu 2 2
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