S09 - Exam 2(1)

# An electron is moving in the xy plane with its

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Unformatted text preview: × B : <" Q 7 0/,* ,%& 2(/-,0*/ A) F must be perpendicular to v but not necessarily to B >" H 7 *(, *+ ,%& 2(/-,0*/ B) ,%& 2(/-,0*/ ?" H 7 0/,* F must be perpendicular to B but not necessarily to v C) ,%& 2(/-,0*/ C" ! 7 0/,* v must be perpendicular to B but not necessarily to F 1/'6 D) all three vectors must be mutually perpendicular ? E) F must be perpendicular to both v and B 3. An electron is moving in the xy plane, with its velocity given by v = 5 × 105 m/s ˆ + ı !"#\$%&' ()* !+,!-+./ 3×105 m/s ˆ. A uniform magnetic ﬁeld of 0.8 T points in the ˆ direction. The magnetic ı force on the electron is: A) 0 B) 2.6 × 10−14 N C) 3.8 × 10−14 N D) 6.4 × 10−14 N E) 1.0 × 10−13 N 2 3. 01) @# A!"K 4 B# A" 4 C# ". 4 )*&< C !K# 9:% 4. The current in!.3! 5.0-Ω resistor in +'7+G'( &:,F* '&< is: +G77%*( '* (:% K the 7%&'&(,7 '* (:% the circuit shown 4. !!! !!!! !!!! ! !!!!!!!!!!!!!!!! !!! 2!. ! A" 4 !!! !!!! !!!! ! !!!!!!!!!!!!!!!! !!! !! !!! !!! !!! ! !!!!!!!!!!!!! !!! !! 0!. ! A" ! !!! !!!! !!!! ! !!!!!!!!!!!!!!!! !!! !!. ! =# ># @# B# C# !"# !!! !!!! !!!! ! !!!!!!!!!!!!!!!! !!! K!. ! A) 0.42 A .!0" = B) .!2J = A!K =C) "!0 =D) !!. = E) )*&< @ 0.67 A 1.5 A 2.4 A 3.0 A !"#\$%&' ()* !+,!-+./ 5. A square loop of wire lies in the plane of the page and carries a current I as shown. 5. !"# \$ %&'()* +,,-is a /0)* +0*%magnetic ﬁeld B parallel to (15 side MK( 6'))*12 7 (%The loop will There ,. uniform 01 23* -+(1* ,. 23* -(4* the 6())0*% as indicated. %3,/1# 83*)* 0% ( '10.,)9tend to rotate: ! -()(++*+ 2, 23* %05* :; (% 01506(2*5# 83* +,,- /0++ 2*15 2, ),2(2*< 9(41*206 !*+5 ! > # # ## #!###!!!!!!!!!!!!!!!!!!#####!!!!!!!!! ? ; !!!!!!!!!!!!!!!! !!!!!!!!!!!#!#!!!!!! !!! # !! ! ## ! ! !!!!!!!!!# # ! ! ! # # ! ! # # ! # # ! ! ! # #! ! ! ! # #! ! ! ! # # ! ! # # ! ! ! ! # # ! ! # # ! ! # # ! !@ ! # # ! =! ! # # ! # # ! ! ! # # ##!# ! ! ! # # ! # ### ### ! # # !" ! # # #!## # # "#! ! ! # # !...
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## This note was uploaded on 09/05/2011 for the course PHYS 116b taught by Professor Haglund during the Spring '07 term at Vanderbilt.

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