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Unformatted text preview: 21.01. . KEY 1. A computer operates at 110 V and 3.25 A. If the cost of electrical energy is
$0.09 / kW—h, determine the cost to leave this computer on for 18 a day for 6 days. a. $5.25
b. $12.42 2. A cylindrical wire of uniform radius of 1.5 cm carries a current of 2.5 A produced
by an electric ﬁeld of 180 V/m directed parallel to the Wire’s axis. Determine the
‘ resistivity of the material of which the wire is made. 0.0181 Q—m
0.0950 Qm
0.4529411
d 0.264 mm 0.051 Q—m 3. In the circuit shown in the ﬁgure, determine the current in the 30 £2 resistor. Assume
that the battery has no internal resistance. ‘ ' 7.» 99‘s? ‘ 0.342 A
0.289 A
0.227 A . 0.496 A © 0.129 A 15:2 20V 949.0%» 3052 4. In the circuit shown, the capacitor is initially uncharged and the switch is open. At
tlme t = O, the switch is closed. At what time t > 0 will the current in the resistor have decayed to 6.0 11A? The battery generates an emf of 12 V with no internal resistance,
R = 300 k9, and C= 60 HF. a. 11.5 s .
(E 34.1 s ‘ R
C. S 6 d. 64.4s
e. 99.83 006 210]
KEY 5. In the circuit shown in the ﬁgure, determine the magnitude of the current in R3. Both _ batteries generate an emf of 9.0 V and have no internal resistance; R1 = 10 Q,
R2 =60 Q, andR3 =20 Q. a. 0.915 A
b. 0.761 A
@ 0.585 A
d. 0.459 A
e. 0.241 A M 6. A particle of unknown charge of magnitude q, unknown mass m and velocity v = (4.8 x 106 m/s) i enters a region of constant magnetic ﬁeld B = (0.5 T) j. The
particle is initially deﬂected in the negative z—direction and follows a semicircular path of radius r = 0.1 m. What is the sign of the particle’s charge and what is its >
charge—tornass ratio q/m? 7. A wire coil of area A = 60 cm2 with n = 100 turns experiences a maximum torque of 18.0 N‘mwhen placed in a uniform magnetic ﬁeld of 2.0 T. What is the current
through the coil? ‘ 8. A very long, thin wire is bent in a plane as shown in the ﬁgure such that the middle of
the wire forms three—quarters of a loop of radius r = 0.15 m ( where r is much less than
the length of the wire). If a current I = 2.0 A ﬂows through the wire, determine the magnitude and direction of the magnetic ﬁeld at point P at the center of the loop in
the wire. . E‘BFISMO‘bT ‘m‘10 130% 9. uniform current of constant current density of magnitude J = 3.0 A/m2 ﬂows
in a long conducting cylindrical tube in the direction parallel to its axis. The inner radius of the tube is r1 = 5 cm, and the outer radius is r; = 6 cm. Find the magnetic
ﬁeld at a d1stance r from the tube’s axis for: a) r < r; and b) r > r2. 10. Two long, parallel wires are separated by a distance d = 0.3 m and carry currents of 11 = 0.2 A and [2 = 0.3 A ﬂowing in opposite directions. Calculate the magnitude of the force exerted by each wire on a 2.0meter—long section of the other wire. Is this
force attractive or repulsive? n. ‘EZI ‘ 8.0X10‘8N ' YC Puluvc C
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 Fall '00
 Littler
 Magnetic Field, Resistor, internal resistance, constant magnetic field, wire forms three—quarters

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