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Unformatted text preview: PHYSICS 2B(a) QUIZ 6 SPRING QUARTER 2000 PROF. SCHULLER MAY [2. 2000
Coulomh' s Law l3 : I (1—131? For a capacitor
42:80 r“
CV = Q 1 r . ' _' ] EDA . Gauss s Law §E  dA = —I p (N C : — (Parallel Plate)
s 80 v d
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Definition of PotentIal V = I E  dl U = ——~——Z——'r Electrostatic Energy
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2
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Nm A :13 E = iv V = R1 RC Circuits Char ' ‘ F : qv X B F = iL X B
rszB
§l§ dl = ADJ] d3 Amperc‘ s law B(r) = E
a 2m
1. In the circuit shown in the ﬁgure below. calculate:
a) the time dependence of the current through the resistor with S
disconnected.
b) the time dependence of the current through the resistor with S connected.
c) the time dependence of the charge in the capacitor with 5 connected. Assume that the initial charge in the capacitor is q(0) = 0. PHYSICS 213(3) QUIZ 6 SPRING QUARTER 2000
PROF. SCHULLER ' MAY 12. 2000 2. Sineg ionized atoms that have been accelerated through a potential 01‘800 V describe
a circular trajectory of locm radius in a magnetic ﬁeld of 0.20 T. What is the mass of these atoms? In. “‘41'33... ‘ "I" AI «I .. o 3. A wire of 62.0 cm length and 13.0 g mass is suspended by a pair of ﬂexible leads in a
magnetic ﬁeld of 0.440 T (see ﬁgure below). What are the magnitude and direction
of the current required to remove the tension in the sdpporting leads? (52.0 cm —*l 4. (BONUS) Name an important invention in the ﬁeld of electronics. L 1;! f (—
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(.61m)‘ (AH T) = o.%"} A ____________—____—_ PHYSICS 213(h) QUIZ a SPRING QUARTER 2000
PROF. SCHULLER MAY 12, 2000
a l , A .
Coulomb a Law F = r For a capacnor
.0 l"
CV = Q
1 . « ~ 1 80A
causs a Law 3GB;  (M = ——‘[ p av c = T (Parallel Plate)
5 V
. . . _ . P * ' l l qiqi ‘ v
Deflnltlon of Potential V =I E  d] U: — —— Electrostatic Energy
°° 2 Iii s,,:s,9><lo” “2 R=p£ =i"—"
Nln A qB
E 2 —6V V = ‘RC Circuits F = qv x B
F = 11. X B
r:uxB ﬁﬁ'di = #uIJ'dE Ampere's law BU) = 52—; In the circuit giVen in the ﬁgure below, the currents are unknown. :1) Write down some of the equations which he]
currents. b.) Write down the differential equation for the charge across the capacitor. c) Solve for the time dependence of the charge across the capacitor assuming
that the initial charge q(0) = 0. [3 you solve for the unknown PHYSICS 2B(b) QUIZ 6 SPRING QUARTER 2000
PROF. SCHULLER ' MAY 12, 2000 2. Sineg charged ions that travel at a speed of 2.0 x IO'5 m/s enter a uniform magnetic
field of 1.20 T that is directed perpendicular to the velocity of the ions. The ions are
observed to follow a circular trajectory of 2.20m radius. Calculate the mass of the
ions. 3. A metal wire of mass m slides without friction on two horizontal rails spaced a
distance d apart, as in the figure below. The track lies in a vertical uniform magnetic
field B. There is a constant current 2' through generator G, along one rail, across the
wire, and back down the other rail. Find the speed and direction of the Mre's motion
as a function of time. assuming it to be stationary at t = O. 4. (BONUS) Name an important invention in the field of electronics. 'l #1 . '
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This note was uploaded on 03/23/2009 for the course PHYS 2b taught by Professor Schuller during the Spring '08 term at UCSD.
 Spring '08
 schuller

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