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

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Craig Ogilvie Craig Ogilvie 11 Review Lecture 16 § Moving charged particle in a q B field § Force is perpendicular to velocity § Two simple examples – if v is perpendicular to B » circular motion, – if v is parallel to B » no force, straight-line § Wire with current – electrons moving, experience magnetic force current of direction in pointing vector a is L B L i F × = § Basis for many applications – maglev trains, loud speakers B v q F × = qB mv R = Craig Ogilvie Craig Ogilvie 22 Goals For Today § Electric motors – wires carrying current experience force in B-field – wire loop supported by an axle => torque => motor § Definition of magnetic moment Craig Ogilvie Craig Ogilvie 33 Torque § Review of torque in pre-lecture video r F 1 τ 1 F r × = τ Craig Ogilvie Craig Ogilvie 44 Question: Torque, 1st round § An initially stationary object is free to rotate about the origin § 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 τ , CC τ , C τ , CC τ , 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 § An initially stationary object is free to rotate about the origin...
View Full Document

{[ snackBarMessage ]}

Page1 / 21

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

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online