18 BiotSavart(1)

# 18 BiotSavart(1) - Summary Lecture17 Quantitative...

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Craig Ogilvie 11 Summary Lecture17 § Quantitative description of electric motors § Torque on a current loop in a B-field Forces on each section of loop Convert this torque to a motor change direction of current every 180 degrees θ moment magnetic ˆ n iA = μ B torque × = = τ

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Craig Ogilvie 22 Goals § How to generate a B-field ? moving charges currents in wire fridge magnets (next week)
Craig Ogilvie 33 Generating a B-Field § How did the B-field get created in the first place? § B-fields are made by moving charges B v q F × = moving charge 1 generates B-field moving charge 2 experiences force in B-field This symmetry is a key part of a coherent picture of B-fields A moving charge experiences a force in a B-field

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Craig Ogilvie 44 B-field From Moving Charge (Movie) Ruth Chabay and Bruce Sherwood Movie m/A Tesla 10 4 constant ty permeabili P to charge from r unit vecto ˆ ˆ 4 7 - 0 2 0 × = = × = π μ r r r v q B
Craig Ogilvie 55 Question: Direction of B-field (I), 1st round § What is the direction of the B-field at point P ?

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## This note was uploaded on 09/20/2011 for the course PHYS 222 taught by Professor Johnson during the Spring '07 term at Iowa State.

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18 BiotSavart(1) - Summary Lecture17 Quantitative...

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