824_Physics ProblemsTechnical Physics

824_Physics ProblemsTechnical Physics - 164 P29.3 Magnetic...

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164 Magnetic Fields P29.3 F v B B q ; Fj v i B B e −= × ±± ej Therefore, B =− Bk ± which indicates the negative direction z . FIG. P29.3 P29.4 (a) Fq v B B == × × × ° −− sin . . . sin . θ 1 60 10 3 00 10 3 00 10 37 0 19 6 1 C m s T e j e j F B 867 10 14 . N (b) a F m × × 167 10 519 10 14 27 13 . . . N kg ±ms 2 P29.5 Fm a q v B B F qv × × = × = ° × ×× 1 67 10 2 00 10 3 34 10 90 334 10 1 60 10 1 00 10 209 10 27 13 14 14 19 7 2 .. . s i n . . kg m s N N m s T 2 e j e j The right-hand rule shows that B must be in the y direction to yield a force in the + x direction when v is in the z direction. FIG. P29.5 P29.6 First find the speed of the electron. ∆∆ Km v e V U = 1 2 2 : v eV m × × 2 2 1 60 10 2 400 911 10 290 10 19 31 7 . . . J C kg ms bg (a) v B B , . . max m s T N × × = × 1 60 10 2 90 10 1 70 7 90 10 19 7 12 e j af (b) F B , min = 0 occurs when v is either parallel to or anti-parallel to B . P29.7 v B B = sin so 8 20 10 1 60 10 4 00 10 1 70 13 19 6 . . s i n ×= × × N C m s T
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .

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