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Unformatted text preview: o solve this problem? (A) Lorentz Force Law (B) E field definition (C) V definition r
r
rr BB ( F = qv × B + qE ) (D) Conservation of Energy/Newton’s Laws (E) All of the above
– Absolutely ! We need to use the definitions of V and E and either conservation of energy or Newton’s Laws to understand the motion of the particle before it enters the B field.
– We need to use the Lorentz Force Law (and Newton’s Laws) to determine what happens in the magnetic field. Calculation
Calculation A particle of charge q and mass m is accelerated from rest by an electric field E through a distance d and enters and exits a region containing a constant magnetic field B at the points shown. q,m
Assume q,m,E,d, and x0 are known. exits here XXXXXXXXX
X X X X X X X X X x0
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d
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enters here
B
B What is B? • Strategic Analysis
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– x0/2 E Calculate v, the velocity of the particle as it enters the magnetic field
Use Lorentz Force equation to determine the path in the field as a function of B
Apply the entranceexit information to determine B Let’s Do It !! Calculation
Calculation A particle of charge q and mass m is accelerated from rest by an electric field E through a distance d and enters and exits a region containing a constant magnetic field B at the points shown. q,m
Assume q,m,E,d, and x0 are known. exits h...
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This document was uploaded on 02/13/2014.
 Spring '14

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