# 5) Ohm s Law gives the relationship between potential difference and current for a.

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1 ) During any process, the net charge of a closed system. a) increases b) decreases c) stays constant ) In equilibrium, the electric field in a conductor is. a) always changing b) a constant non-zero value c) zero 3) Equipotential surfaces are to electric field lines. a) parallel b) perpendicular c) unrelated 4) Capacitors store. a) electric charge b) momentum c) magnetic fields 5) Ohm s Law gives the relationship between potential difference and current for a. a) resistor b) inductor c) capacitor 6) Outlets in your house are all wired in. a) series b) parallel c) either series or parallel

2 7) Outside a magnet, field lines point from. a) north to south b) south to north c) neither 8) A charged particle moving in a magnetic field will accelerate the field. a) with b) perpendicular to c) against 9) A change in will always induce an EMF. a) magnetic field b) magnetic force c) magnetic flux 0) At resonance, the impedance of the circuit is. a) zero b) a maximum c) a minimum ) In an alternating current RLC circuit, the voltage across the resistor leads the current through the resistor. a) sometimes b) always c) never ) A radar gun is used to catch speeding cars moving away from the radar gun. The frequency of the reflected radiation is the frequency of the original radiation. a) greater than b) less than c) equal to

3 Two charges are situated as shown in the diagram (each grid line is separated by meter). The left charge is +0-6 C. The right charge is C. 3) What is the magnitude of the net electric force on each charge? +y a) N b) N c) N d) N e) N +x 4) What is the net electric potential at the point (0, ) on the positive y-axis? a) -38 V b) -5 V c) 0 V d) 5 V e) 38 V 5) Where (on the x-axis) is the electric field zero? a) 4.85 m b) 0 m c) -6.3 m d) -0.5 m e) -9.8 m

4 A square loop, in the plane of the page (0 cm on a side), is pushed into a uniform magnetic field, that points into the page, with a constant velocity of 8 m/s. A force of 5 N is needed to do this, and a current of 0.3 A is induced in the loop. 6) What is the magnitude of the magnetic field? a) 54 T b) 390 T c) 387 T d) 4485 T e) 5900 T 7) What is the resistance of the loop? a) 4,850 ohms b) 4,850 ohms c) 34,850 ohms d) 44,850 ohms e) 54,850 ohms

5 An electron moves into (with v = 650,000 m/s) a magnetic field that has a strength of T. The mass of an electron is 9. x 0-3 kg. 8) What is the radius of curvature of the path of the electron? a).9 cm b).9 cm c) 3.9 cm d) 4.9 cm e) 5.9 cm 9) What is the magnitude of acceleration of the electron? a).7 x 0 3 m/s b).7 x 0 3 m/s c) 3.7 x 0 3 m/s d) 4.7 x 0 3 m/s e) 5.7 x 0 3 m/s Two parallel currents are 8 cm apart. One wire has a current of 6 A upward and the other has a current of A downward. 0) What is the magnitude of the magnetic field at a location between them that is 5 cm from the 6 A current and 3 cm from the A current? a) 5.8 x 0-5 T b) 6.8 x 0-5 T c) 7.8 x 0-5 T d) 8.8 x 0-5 T e) 9.8 x 0-5 T

6 You are given the following circuit with V = 8 V, R = 5 and R = 0. ) Calculate the current through the battery. a) 0 A b).8 A c) 5.6 A d) 8.4 A e) 8 A V R R ) If R was made from copper ( = m) and is 3 m long, what is its cross sectional area? a).0 x 0-8 m b).0 x 0-8 m c) 3.0 x 0-8 m d) 4.0 x 0-8 m e) 5.0 x 0-8 m The following circuit has the values: V = 8 V, C = F, C = F, C3 = 3 F, C4 = 4 F. 3) What is the charge on capacitor C? a) 3.9 C b) 5.9 C c) 7.9 C d) 9.9 C e).9 C V C C C 3 C 4 4) What is the potential difference across capacitor C 4? a).55 V b).55 V c) 3.55 V d) 4.55 V e) 5.55 V

7 A simple RLC series circuit with R = 6 ohms, C = 4.x0-6 C, and L = 5.3 x0-3 H. is connected to a generator (f = 350 Hz, V = 5 V). 5) What is the maximum voltage across the resistor? (a) 0.5 V (b).5 V (c).5 V (d) 3.5 V (e) 4.5 V 6) What is the reactance of the inductor? (a) 5 ohms (b) 5 ohms (c) 35 ohms (d) 45 ohms (e) 55 ohms 7) What is the average power dissipated in the circuit? (a).47 W (b).47 W (c) 3.47 W (d) 4.47 W (e) 5.47 W 8) What is the current in the circuit when the voltage across the generator is a maximum? (a) 0.6 A (b) 0.6 A (c) 0.36 A (d) 0.46 A (e) 0.56 A

8 Unpolarized light with a wavelength of 400 nm ( m ) and an intensity of 4.6 W/m is incident on two linear polarizers. 9) What is the frequency of this radiation? (a) 3.5 x 0 4 Hz (b) 5.5 x 0 4 Hz (c) 7.5 x 0 4 Hz (d) 9.5 x 0 4 Hz (e).5 x 0 4 Hz 30) If the intensity after the second polarizer is 0.9 W/m, what is the angle between the transmission axes of the two polarizers? (a) 3 (b) 4 (c) 5 (d) 6 (e) 7

9 F ma kqq U r A C o d C p Online Physics Formulas C C kq q F r U V q o Q V C F E q o kq V r U C QV C s C R s R R kq E r V E d Q I t R L RC R V IR P IV Q Q o e A t RC oi Q Q o e F qvbsin F ILB sin B r B ni mv o r B BAcos emf vbl qb emf N t Z R B X L X C P V rms I rms cos c o o I I o cos LI U s s V p N p tan U X L R X C R p R t V N V I Z rms rms X c X L fl fc f o c f LC oe B E cb o 9 k Nm / C o C / m N q 9 e.600 C o / 8 c 30 m / s Tm A

10 ON-LINE PHYSICS EXAM # MR. POTTER Name: Date: ) Bubble in the ID number section of the scantron. ) This Exam is 90 min long - 30 multiple-choice questions. Choose the one BEST answer for each question. You are not penalized for guessing. Watch your time! (Answer all questions.) 3) You may use only a pencil and calculator. (Formula sheet is provided.) 4) Use the test as scratch paper (or the paper provided by the testing center). Hand EVERYTHING back in or you will receive a 0 on the exam! 5) Scoring: all 5 answer choice questions are 6 pts. each, all 3 answer choice questions are 3 pts. each, all answer choice questions are pts. each. Total possible points = 44 pts. 6) This is test form A. Be sure to FILL THIS IN on your scantron form. All forms are equivalent tests (only numbers have been changed.) 7) Also, write your name, the class, the date, and my name on the scantron form. Good Luck!

11 DID YOU BUBBLE IN AN ID NUMBER AND TEST FORM ON THE SCANTRON? (see front page for instructions)

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