Lecture 21 - Hall effect. Current loops. Magnetic field by a moving charge

Lecture 21 - Hall effect. Current loops. Magnetic field by a moving charge

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1 Lecture 21 Hall effect Current loops Hall effect. Current loops. Magnetic field by a moving charge. Hall effect (qualitative) B out of the screen F M v Positive charge carrier E Hall Charge accumulates on the sides of the slab ( positive on top and negative at the bottom). Electric field (electric potential between sides) I Hall effect (quantitative) B M q > 0 Hall L d V H E Charge stops shifting to the sides to the slab when M E FF M FILB H V ILB H ILdB We can tell the charge of one carrier!!! EH FqE H Force on a square loop of current The square loop below has side length and carries a current . The magnetic field points out of the screen and is uniform. What is the net force on the loop? Magnitude of force is the same on all four sides: F = Net force is zero.
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2 Current loop in a uniform B field ( in any direction, not necessarily in the plane of the screen) 0 dl The net force on a closed loop of current in a uniform field is always zero. 0
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This note was uploaded on 09/21/2011 for the course PHYS 222 taught by Professor Johnson during the Spring '07 term at Iowa State.

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Lecture 21 - Hall effect. Current loops. Magnetic field by a moving charge

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