20.1 Physics 6B Magnetic Forces and Fields

20.1 Physics 6B Magnetic Forces and Fields - Physics6B

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Physics 6B Magnetic Forces and Fields Prepared by Vince Zaccone For Campus Learning Assistance  Services at UCSB
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What creates a magnetic field? Prepared by Vince Zaccone For Campus Learning Assistance  Services at UCSB
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What creates a magnetic field? Answer: MOVING CHARGES Prepared by Vince Zaccone For Campus Learning Assistance  Services at UCSB
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What creates a magnetic field? Answer: MOVING CHARGES What is affected by a magnetic field? Prepared by Vince Zaccone For Campus Learning Assistance  Services at UCSB
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What creates a magnetic field? Answer: MOVING CHARGES What is affected by a magnetic field? Answer: MOVING CHARGES Prepared by Vince Zaccone For Campus Learning Assistance  Services at UCSB
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What creates a magnetic field? Answer: MOVING CHARGES What is affected by a magnetic field? Answer: MOVING CHARGES We have a formula for magnetic force on a moving charge: ) sin( B v q B v q F mag θ = × = Prepared by Vince Zaccone For Campus Learning Assistance  Services at UCSB
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What creates a magnetic field? Answer: MOVING CHARGES What is affected by a magnetic field? Answer: MOVING CHARGES We have a formula for magnetic force on a moving charge: ) sin( B v q B v q F mag θ = × = This is a vector cross-product.  We need a right-hand-rule to find the direction of this force. How to find the direction: 0)Use your RIGHT HAND 1)Fingers start in the direction of the charge’s velocity. 2)Curl fingers toward the direction of the magnetic field. 3)Thumb points in the direction of the magnetic force on the charge. 4)If the charge is negative, flip your hand over. Important notes:  If velocity is aligned with the magnetic field, force is zero.             Magnetic force is always perpendicular to both the velocity and the B-field.   Prepared by Vince Zaccone For Campus Learning Assistance  Services at UCSB
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X X X X X X X X X X X X X X X X X X X X X X X Prepared by Vince Zaccone For Campus Learning Assistance  Services at UCSB B A uniform magnetic field is directed into the page. Find the direction of the magnetic force on charge A, a positive charge. A
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20.1 Physics 6B Magnetic Forces and Fields - Physics6B

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