# Sample Exam #3 Electricity Physics 103 Spring 2011

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1 Sample Exam #3 Electricity Physics 103 Spring An electric heater is constructed by applying a potential difference of 110 V across a wire with a resistance of 5.0 Ω. What is the power rating of the heater? a. 2.0 kw b. 2.4 kw c. 1.7 kw d. 1.5 kw e. 60 kw I = 110V = 22 A 5.0Ω P = I 2 R = (22) 2 (5Ω) = 2420 W = 2.4 kw 2. A 4.0-Ω resistor has a current of 3.0 A in it for 5.0 min. How many electrons pass through the resistor during this time interval? a b c d e Q I = ; t Q= I t = = 900 Q= q N N = I t/ q= 900 / = A wire (length = 2.0 m, diameter = 1.0 mm) has a resistance of 0.45Ω. What is the resistivity of the material used to make the wire? a Ω m b Ω m c Ω m d Ω m e Ω m L R = ρ A A π (0.001) ρ = R = Ω L 2 m = Ω m

2 4. A small bulb is rated at 7.5 W when operated at 125 V. Its resistance (in ohms) is a b c. 17. d e P= V / R R V P 2 2 = / = 125 / 7.5 = 2083 Ω 5. What is the current in the 10-Ω resistor? a A b. 3.0 A c. 1.4 A d. 2.4 A e A I = V / R I = 21[ V] / (10[ Ω ] + 5[ Ω ]) = 21[ V] /15[ Ω ] = 1.4[ A] 6. A resistor of unknown resistance and a 15-Ω resistor are connected across a 20-V battery in such a way that a 2.0 A current is observed in the battery. What is the value of the unknown resistance? a. 75 Ω b. 12 Ω c. 7.5 Ω d. 30 Ω e. 5.0 Ω The equivalent resistance is 20V/2A=10Ω. If one of the known resistors is 15Ω, then there is only one way to connect the two resistors: in parallel. (note if you connect them in series, then the equivalent resistance should be more than 15Ω). Thus we are looking for the unknown resistance: = + 10Ω 15Ω R R = / (15 10) = 30Ω

3 7 What is the potential difference VB VA when the I= 1.5 A in the circuit segment below? a. +22 V b. 22 V c. 38 V d. +38 V e V Without the EMFs, the potential difference is -30V. Two EMFs add a positive (20V-12V=+8V) shift. Finally, the potential difference VB VA = -30V+8V=-22V. 8. What is the equivalent resistance between points a and b when R = 13 Ω? a. 29 Ω b. 23 Ω c. 26 Ω d. 20 Ω e. 4.6 Ω We have 3 resistors in parallel: = + + = Req 1 R 2R 3R 6R R = (6 /11) R eq1 This equivalent resistor is connected in series with R (the bottom one). The total resistance: (6/11)R+R=(17/11)R. Plug 13 Ω instead of R and obtain: 20Ω 9. If R1 = 10 Ω, R2 = 15 Ω, R3 = 20 Ω, and I = 0.50 A, at what rate is heat being generated in these resistors? a. 29 W b. 16 W c. 22 W d. 11 W e. 1.1 W The equivalent resistance for three resistors in series is: 10 Ω+15 Ω+20 Ω=45Ω. Power P=I 2 R=0.5*45=22.5W

4 10. A 10-V battery is connected to a 15-Ω resistor and an unknown resistor R, as shown. The current in the circuit is 0.40 A. How much heat is produced in the 15-Ω resistor in 2.0 min? a kj b kj c kj d kj e kj Heat=P*t=I 2 *R*t=0.4 2 *15*2*60=288 J= 0.29 kj 11. If body P, with a positive charge, is placed in contact with body Q (initially uncharged), what will be the nature of the charge left on Q? a. must be equal in magnitude to that on P b. must be negative c. must be positive d. must be greater in magnitude than that on P e. must be negative and less in magnitude than that on P Only positive charge can be left on Q that originates from positive charge on P. The total charge will be redistributed between Q and P according to their capacitances. 12. Two point charges are 4 cm apart. They are moved to a new separation of 2 cm. By what factor does the resulting mutual force between them change? a. 1/2 b. 2 c. 1/4 d. 4 e. 1 The force between two charges: F q κ q =. If distance decreases by a factor of 2, then r12 the force increases by a factor of Two equal charges, each Q, are separated by some distance. What third charge would need to be placed half way between the two charges so that the net force on each charge would be zero? a. Q b. Q/2 c. Q/4 d. Q/8 e. Q/16 The middle charge q will be in equilibrium for any value of the charge. But for two charges at the right and left sides, the forces need to balanced. So, the middle charge should have an opposite sign. For example, for the charge on the left:

5 qq QQ F = κ + κ = ( R/2) R 4qQ QQ = ; 2 2 R R 4 q = Q; q = Q/ A 9.0-V battery is connected between two parallel metal plates 4.0 mm apart. What is the magnitude of the electric field between the plates? a N/ b. 9.0 N/ c. 2.3 N/ d N/ e N/ E = V d = 9 = 2.25 x 10 3 N/ A uniform electric field, with a magnitude of 600 N/, is directed parallel to the positive x-axis. If the potential at x = 3.0 m is V, what is the change in potential energy of a proton as it moves from x = 3.0 m to x = 1.0 m? (q p = ) a J b J c J d. 500 J e J U = q*e X * x = 600 (1.6 x ) (3-1) = 1.92 x J 16. An electron in a cathode ray tube is accelerated through a potential difference of 5.0 kv. What kinetic energy does the electron gain in the process? (e = ) a J b J c J d J e J U = q* V = ½ mv 2 = K = * 5000V= J

6 17. What is the equivalent capacitance between points a and b? All capacitors are 1.0 µf. a. 4.0 µf b. 1.7 µf c µf d µf e µf series = ( + ) ( ) = 2+ + = ( + ) 1 + = Where =1 µf µ F 18. A metallic conductor has a resistivity of Ω m. What is the resistance of a piece that is 30 m long and has a uniform cross sectional area of m 2? a Ω b. 180 Ω c. 160 Ω d. 90 Ω e. 60 Ω L R = ρ A 30*18 x 10-6 = 6(30) = 180 Ω 3.0 x A 60-W light bulb is in a socket supplied with 120 V. What is the current in the bulb? a A b. 2.0 A c. 60 A d A e A P=V*I I=P/V=60W/120V=0.5A

7 20. A resistor is connected to a battery with negligible internal resistance. If you replace the resistor with one that has twice the resistance, by what factor does the power dissipated in the circuit change? a b c. 4.0 d. 2.0 e. 1.0 We assume that the voltage remains the same. Power P=V 2 /R If resistance increased by 2, then the power decreases by 2. _ 21. The heating coil of a hot water heater has a resistance of 20 Ω and operates at 210 V. How long a time is required to raise the temperature of 200 kg of water from 15 to 80? (The specific heat for water = 10 3 cal/kg and 1.0 cal = J.) a. 1.7 h b. 3.8 h c. 5.1 h d. 6.9 h e. 8.8 h I = V = 210 = 10.5 A R 20 P = I 2 R = (20) = 2,205 W; Q heater =P*t; Q water = m*c* T = 200kg * 4186J/kg* (80-15)K= 54,418,000J t = Q = 54,418,000 = 24,679 x 3,600 P 2,205 = 6.85 hours 22. An 8.00-Ω resistor is dissipating 100 watts. What are the current through it, and the difference of potential across it? a A, 28.3 V b A, 12.5 V c A, 28.3 V d A, 3.54 V e A, 3.54 V P = I 2 R P = VI 100 = I 2 (8) 100 = V(3.54) 12.5 = I I = 3.54 A V = 28.3V 23.Resistors of values 6.0Ω, 4.0Ω, 10.0Ω and 7.0Ω are combined as shown. What is the equivalent resistance for this combination?

8 a. 2.3 Ω b. 3.0 Ω c Ω d. 27 Ω e. 30 Ω = + = The equivalent resistance for three resistors on the right is: Req 1 7Ω 4Ω+ 10Ω 14Ω R = 14 / 3Ω= 4.66Ω Finally, we combine it with the single one on the left: 6 Ω Ω = Ω eq1 24. What is Kirchhoff's 1st equation for this junction? Answer Section a. I 1 = I 2 + I 3 b. I 2 = I 1 + I 3 c. I 3 = I 1 + I 2 d. I 1 + I 2 + I 3 = 0 e. I 2 = I 3 I 1 + I 2 + I 3 = 0 Kirchhoff's equation for this junction One of the currents should be negative with respect to the shown direction. 1B 2B 3 4E 5 6D 7B 8D 9D ANS: TOP: Insulators and onductors 12. ANS: D TOP: oulomb's Law 13. ANS: TOP: oulomb's Law 14. ANS: A TOP: Potential Difference and Electric Potential 15. ANS: B TOP: Potential Difference and Electric Potential 16. ANS: B TOP: Potential Difference and Electric Potential 17. ANS: TOP: The Parallel-Plate apacitor, ombinations of apacitors 18. ANS: B TOP: Resistivity 19. ANS: A TOP: Electrical Energy and Power 20. ANS: A TOP: Electrical Energy and Power 21. ANS: D TOP: Electrical Energy and Power 22. ANS: TOP: Electrical Energy and Power 23. ANS: TOP: Sources of emf, Resistors in Series, Resistors in Parallel 24. ANS: D TOP: Kirchhoff's Rules and omplex D ircuits

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