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Unformatted text preview: and pos itive ions in liquids , eac h of whic h ac t as "c onduc tors " for their free c harges . Par t B
If one replac es the c onduc ting c ube with one that has pos itive c harge c arriers , in what direc tion does
the induc ed elec tric field point?
ANSW ER: Correct
The direc tion of the elec tric field s tay s the s ame regardles s of the s ign of the c harges that are free
to move in the c onduc tor.
Mathematic ally , y ou c an s ee that this mus t be true s inc e the ex pres s ion y ou derived for the
elec tric field is independent of .
Phy s ic ally , this is bec aus e the forc e due to the magnetic field c hanges s ign as well and c aus es
pos itive c harges to move in the
direc tion (as oppos ed to pus hing negative c harges in the
direc tion). Therefore the res ult is alway s the s ame: pos itive c harges on the
c harges on the
alway s point in the s ide and negative s ide. Bec aus e the elec tric field goes from pos itive to negative c harges
direc tion (given the original direc tions of and will ). Charged Particles Moving in a Magnetic Field Ranking T ask
Five equal-mas s partic les (A–E) enter a region of uniform magnetic field direc ted into the page. They follow
the trajec tories illus trated in the figure.
session.master ing physics.com/myct/assig nmentPr intView?assig nmentID= 2252604 4/19 24 03 2013 HW- 5 Par t A
W hic h partic le (if any ) is neutral? Hin t 1. Neutral particles
Sinc e the magnitude of the magnetic forc e ac ting on a partic le is given by
a neutral partic le (with ) will not ex perienc e a magnetic forc e. ANSW ER:
partic le A
partic le B
partic le C
partic le D
partic le E
none Correct Par t B
W hic h partic le (if any ) is negatively c harged? Hin t 1. F ind the direction of the magnetic force
The direc tion of the magnetic forc e is determined by the right-hand rule. W ith the given
direc tions for veloc ity and magnetic field, what is the direc tion of the magnetic forc e on a
pos itively c harged partic le?
ANSW ER: session.master ing physics.com/myct/assig nm...
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- Spring '10