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Unformatted text preview: Practice MC 3f23r’07 1. The drift velocity of an electron in a wire varies directly with the number ct charge carriers pe u"it volume.
directly with the crosssectional area of the cc::dl ::ting wire. A
B
C. directly with the charge carried carried by it.
D directly with the current flowing in the conducxng wire.
E inversely with the current flowing in the conch. ::ti 2;] wire. 2. The resistivity of any given metal A. depends on its temperature.
B. varies nearly linearty with temperature. C. is the proportionality constant between the rest: Ia ' :e. R, and the ratio of the
length, L, to the crosssectional area, A, of a w a ' ade of the metal. D. has units of ohmmeter. E. is described by all of the above. 3. A potential difference of 120 V produces a current of 8.( A it the heating element of a
toaster. What is the resistance of this heating element 'if i e the toaster is carrying
this current? “a A 6.7x10—2 £2
_ B 15 Q
__ C. 0.96 k!)
_ D 67 Q
E 30 Q 4. A resistor carries a current l. The power dissipated in he ‘esistor is P. What is the
power dissipated if the same resistor carries current 5 '? __ A. P _ B. 3:”
_ C. Pr’3
_ D. 9:0
_ E. PIP 120 160, In this circuit. the current ithrough the battery is app 3: inater
A. 1.7 A _B. 4.4A
Ho. 0.36A
_o. 0.6OA
_E. 3.4A
33V
}—._
+ _.
2151
180 The power dissipated in the 219 resistor in this oiroL '_ i: __ A. ‘14 W
B. 68 W
C. 43 W
D.
E. 13W None of these is correct. 12.0 The circuit in which the voltmeter and the ammeter are correctly arranged to determine the value of the u ' sin :1wn resistance F? is A.'l _ B.
__ C.
_ D.
_ E. macam An uncharged capacitor and a resistor are connected in at us to a battery. If E: 15 V,
C: 20 HF, and Fl = 4.0 x105 Q. the time constant of tr e t :'CuIt is approximately A 105 __ B. 8.0 3
_ C. 18 s
_ D. 4.0 s E. 2.5 s 10. 11. (1) (2) (3) {4) (5) The curve that best represents the current in a discharg; n; RC circuit as a function of
time is _ A. 1
W B. 2
_ . 3
__ D. 4
_ E. 5
A charged particle is moving horizontally westward wi I .2 velocity of 3.5){10E male in a region where there is a magnetic tietd of magnitude .6: . '0—5 T directed vertically
downward. The particle experiences a torce of 7.8x10“ ‘6 l'l northward. What is the charge on the particle?
.___ A. +4.0x‘lO—‘B C
B. —4.0r<10—18 C . +4.9x10—5 C
D. ~—~1.2x10"14 C
E. +1.4 xiO—H C A uniform magnetic field of 200 T is directed vertically 1 award. The force on an
electron (q : 1.6x10—19 C) moving horizontally north'an: at 2.0x105 mfs is
approximately A. 4.0)(08 N, east
El. 24x10i3 N, west . 6.4 x10‘11 N, west
D. 6.4 1110*“ N, east
E. zero Answer Key
Practice MC 323%)? 1. D
2 E
8 B
4 D
5 A
6 E
7 C
8 B
9 B 10. B ‘11.C ...
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 Spring '08
 Courant
 Physics

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