17 BTorques

# 17 BTorques - Craig Ogilvie Craig Ogilvie 11 Review Lecture...

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Unformatted text preview: Craig Ogilvie Craig Ogilvie 11 Review Lecture 16 Â§ Moving charged particle in a q B field Â§ Force is perpendicular to velocity Â§ Two simple examples â€“ if v is perpendicular to B Â» circular motion, â€“ if v is parallel to B Â» no force, straight-line Â§ Wire with current â€“ electrons moving, experience magnetic force current of direction in pointing vector a is L B L i F Ã— = Â§ Basis for many applications â€“ maglev trains, loud speakers B v q F Ã— = qB mv R = Craig Ogilvie Craig Ogilvie 22 Goals For Today Â§ Electric motors â€“ wires carrying current experience force in B-field â€“ wire loop supported by an axle => torque => motor Â§ Definition of magnetic moment Craig Ogilvie Craig Ogilvie 33 Torque Â§ Review of torque in pre-lecture video r F 1 Ï„ 1 F r Ã— = Ï„ Craig Ogilvie Craig Ogilvie 44 Question: Torque, 1st round Â§ An initially stationary object is free to rotate about the origin Â§ What is the direction of the torque and which way will the object begin to rotate, clockwise (C) or counter-clockwise (CC) origin F 1. 1 2. 2 3. 3 4. 4 Ï„ , CC Ï„ , C Ï„ , CC Ï„ , C 1 of 300 Craig Ogilvie Craig Ogilvie 55 Question: Torque, 2nd round 100% 0% 0% 0% 100% 0% 0% 0% 1 2 3 4 Â§ An initially stationary object is free to rotate about the origin...
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17 BTorques - Craig Ogilvie Craig Ogilvie 11 Review Lecture...

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