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Lecture 14

# Lecture 14 - Motor Motor-Madness 2010 2010 The winners are...

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Motor-Madness 2010 Motor Madness 2010 The winners are: Brad Freeman, Corey Midkiff, Jesse Kirkwood, and Phillip Watson: 1035 RPM! Fabulous prizes include: An official KSU physics bouncy ball! A high intensity five minute glow stick!! The adulation of your classmates!!! Note design features Oblong shape maximizes area while minimizing rotational inertia and allowing operation close to magnet where field is inertia and allowing operation close to magnet where field is strong.

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Forces between long current-carrying wires: i t experiment We find the following: The force is attractive when the currents are in the same direction. The force is repulsive when the currents are in the opposite direction. The force is proportional to the product of currents in the wires. The force weakens as the inverse of the distance between wires. These observations are explained if the B-field produced by a wire Has a magnitude proportional to the current in the wire. Has a magnitude that falls of as 1/distance from the wire. Has a direction that circulates in the wire in a sense given by right-hand-rule#3: Put the thumb of your right hand along the current. Your fingers circle in the direction of the field.
Directions examples I 1 B 2 Æ 1 F 2 Æ 1 I 2 B 1 Æ 2 F 1 Æ 2 I 1 B 2 Æ 1 F 2 Æ 1 I 2 B 1 Æ 2 F 1 Æ 2

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Direction check What is the correct combination of the quantities B 1 Æ 2 d F th fi ld d d b i 1 t th iti f and 1 Æ 2 , the field produced by wire 1 at the position of wire 2 and the force on wire 2 caused by the field of wire 1, respectively.
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