This preview shows pages 1–5. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
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 ...
View
Full
Document
 Spring '08
 Courant
 Physics

Click to edit the document details