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Lecture 15 feb21 preview - Lecture 15 Magnetic forces on...

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Lecture 15 Magnetic forces on Currents Last time our focus was: F magnetic does no work on the electrically charged particle —it doesn’t change speed B v q F × =
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Magnetic force on currents? Consider the force dF on the charges dq flowing/ drifting in a wire segment of length dl B l Id F d l d dt v B dt v I B v Idt F d Idt dq B v dq F d d d d d × = = × = × = = × = , since ) ( ) ( and ) ( + + dl Integrate for wire of arbitrary shape Straight wire of length L: B L I F × = demos
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Question 1: Current Loops What is the direction of the magnetic force on a ccw circular current loop with its plane ┴ to a uniform B? B into page A. Into page B. Out of page C.CCW D.CW E. Zero
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Question 2 What is the direction of the magnetic force on a rectangular loop whose plane normal makes a 45 º angle with B field. B up A. Left B. Right C.Up D.Down E. Zero This is a general result for any shape and orientation of current loop in a uniform B field……….
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Current Loop: F net =0, what about τ?
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