PHYSICS 240 Exam 3--Fall 2004

# PHYSICS 240 Exam 3--Fall 2004 - 2 PhqArc-s Qb F'tAzoo4...

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1. The magnetic field independ'ent of: 'A(the current. ^V ,, "q * \r\tL i W l r ' . i\ilt i' i.-- Bft = Bv'.nt'o .}i\i vi " '"'- t\ u Q^'oo SYnt'o-' & '\ ur= #,.''r-l' *j \ * * - * B. 1 .15 Q9_0s D . 2 E. 1 PhqArc-s 2 Qb F*'tAzoo4 ttsp.^^3 B (magnitude and direction) insidea long ideal solenoid is )\$= )lo'L ry -;; Te { \ \ A ' J'a'dt' llota,nc\$- has a larger resistance and a has the same resistance.Td " smaller capacitance' U= - t'^'Q. q/'A(cr)-t" / ) B. the core material. ( Br the number ol turns per unit length of the windings. * (t the cross-sectional area of the solenoid' ,(tfre direction of the current. z, The graphs show the time-dependences of thea-mplit!-dqg"q99!ll-a!O4s-tn IL.e capacitor energy for two fol lorrying statements could be true? E f).. n"tutiue to circuit 2, circuit t hasa smaller resistance and a larger inductance. {t n"tutive to circuit 2, circuit t has a larger resistance and a Y smaller inductance. ive to circuit 2, circuit t has the same resistance and a larger inductance. D. Relative to circuit 2, circuit 1 ,larger capacitance. F.. Relative to circuit 2, circuit 1 V= L& 3. The normal to a certain 1-m2 flat area makes an angle of 60 degrees wjth a uniform magnetic field present in all parts of the area. The magnetic flux through this area is thelame as the flux through a second flat area that is perpendicular to the field if the second area (in m') is Ocv't uo

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4. In a sinusoidally driven series RLC circuit, the inductive reactance is Xs= 200e, the capacitive reactance is X6 = 100 f), andthe resistance is R = 50 fl, The current and applied emfwould be in phase 't _ .l V A. the resistance is increased to 100 e, with no other changes. t B. the resistance is increased to 200e, with no other changes. c. the inductance is reduced to zero, with no other changes. \l='t fu 1fine capacitance is doubled, with no other changes. \-< (gtne capacitance is harved, with no other changes. 7* 6;s nrf,l\$ir"gulr-trrre 5. A 1O-turn solenoid has an inductance of 3.5mH. When the solenoid carries a current of 2.0 A the magnetic flux (in wb) through each turn is: 1,5u)6" ".390- L t v +* L2cm --+ 100 X x x v X X \ < V --i\ 4v L€"tt \ t*,w,*r-ol , { - i:0ontlaq t A . 0 B. 3.5 x 10r t''-f'\ (9/ 7.0 x 10* D. 7.0 x 10-3 E. 7.0 x 10-2 g,3 rcf dS +\ V= to *u'rut'b 2,0 ft t * \1OT1t ,2\v I - r o f v a L /D\ \v I f I I L2 cm I I I I + ', tn - /r\ lt<- - l) t+,-- ; - 4 l u - , ' lD 6. The circuit shown is in a uniform magnetic field that is into the page andis decreasing in magnitude at the rate i50 T/s, Thecurrent in the circuit (in A) is: -.---*-----=\ db (t-or9' fv B. 0.22 r ^d,A, \^ uJrr 0y I D. 0.62 p ..^<,, r toz\ \ - P -' \?n \'t' '/
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