Premittivity Constant - Introductory Physics - Solved Paper, Exams of Physics

Download Premittivity Constant - Introductory Physics - Solved Paper and more Exams Physics in PDF only on Docsity! FROM : Fax NO. : May. 21 2842 11:47AM PL Physics 8B Spring 2002 (Section 2) FINAL EXAM Useful data; Permittivity constant & = 8.85 x 10°? C’/N-m? Permeability constant [jy = 4 x 107 T-m/A Elementary charge e = 1.6x 10°" C Planck’s constant 4 = 6.63 x 107 J-s Speed of light c = 3.0 x 10° m/s leV=16x10"F 1. (10 pts) Two charges, g, = 1.0 uC and g, =—-2.0 UC, porta t are initially positioned as shown, A third charge ' ' 9, = 3.0 LC is then brought in from infinity, and then a ‘ \ fourth charge g, = —4.0 WLC is also brought in from fl i infinity, so that the charges are at the vertices of a ! 1 square 0.50 m on a side. How much work is done by 1 ! outside forces in bringing the two charges in? Does it 9 rate ¢ matter which order the charges are brought in? 4 2. (15 pts) In the circuit, what do the ideal voltmeter and ideal ammeter read? Assume that all the resistors have R = 2.0 Q, except for the battery’s internal resistance, which is 7 = 0.50 Q, The battery has an emf of 12.0 V. 3. (15 pts) Three parallel wites are arranged as shown, at the vertices of an equilateral triangle with length 2.0 m on each side. | Wire 1 has a current i, = 4.0 A going into &4 the page, wire 2 has a current i, = 2.0 A | going into the page, and wire 3 has a current 4, = 3.0 A coming out of the page. What is the magnitude and direction of the net force per unit length on wire 1? FROM : Fax NO. : May. 21 2842 11:48AM Pe (10 pts) A S.0 [LF capacitor consisting of two parallel circular plates of radius 20.0 cm has current flowing into it, so that the potential difference across it increases steadily from V=0 to V= 100 V in 5.0 ms. (a) What is the current going into the capacitor? (6) What is the total displacement current? (c) What is the B field at a point inside the plates and 12.0 cm from the center of the capacitor? (d) What is the B field at a point just outside the plates and 12.0 cm from the wire? av 8? (15 pts) An object is placed 20.0 cm in front of a lens, A second lens is 25.0 cm behind the first and has a focal length of +10.0 cm. A final image of the object appears 12.0 cm behind the second lens. (a) Is the second lens convex or concave? (b) What is the focal length of the first lens? (c) Is the first lens convex or concave? (d) What is the overall magnification produced by the two lenses? (e) Is the final’ image upright or inverted? . (10 pts) Light of wavelength 550 nm passes throngh twa slits and forms a pattern on a sereen 1.50 m away. It is found that the fifth bright fringe is 80.0 cm away from the central maximum, and the second diffraction minimum is 60.0 cm away from the central maximum. (a) What are the slit width and the distance between the slits? (b) How many bright fringes appear on either side of the central maximum? (c) How many diffraction minima appear on either side of it? (16 pts) Two observers, Sam and Ian, observe two events. Sam observes the time interval between them to be 15.0 us, whereas Ian observes them to take place 6.0 [is apart. Ian also observes them to occur at the same location. (a) What is the relative velocity between Sam and Ian? (6) How far apart in space does Sam observe the events to take place? (15 pts} A photon of wavelength 0.710 pm collides with a stationary fictitious particle called the zoan. The scattered photon has a wavelength of 0.960 pm and scatters at an angle of 35° to the incident photon’s direction, (a) What is the mass of the zoan? {b) Find the speed and wavelength of the zoan after the collision. (1 pm = 10"? m) May. 21 2882 11:49AM PS FROM + FAX NO. t 3, \ File Fad. o 3 a, Fe 2 Mes (4rv lO Mola. a, Fosro7? Mom @ b Ler of 2m (21 fe a Matis . (4m ee CH 01 Re) 4 cot! Mm (O) lard “Lae. Fret, > Fain, Favs ‘ u £ é > - Fas Cos be° t Fr ewe fo° @ tL L 6 > foro Mim Foey - Frey L Fry \ CO ET \ Fi. KE Q) sm me GO° FF pm go° L L —7 > Yoxwrto Min 4 Fret 2 Jie nn Ve Ch aeto) = | Odio Mn Y L -? ten O> Fred y Me x torte ‘ BR 2L™ abn +z dlore ction Fas ale Poe % FROM FAX NO. + May. 21 2082 11:49AM Pe 4 ~. AQ v . ay Ct eR, a > av zc aV ° a 3 60M) c At aot 2 (re+to§) Cleenme) @ Sy O4167* = O,10A (bV ye 63 O10A (® Ce) Be Met ga Deine pyro Aye 036A dre! rel. ae* _ @ R- (yn aio” 10,026) = Con T Lr¢o, (th (a) pe Aes n Merete ete 2 Lersso TQ) bar po fat FROM : Fax NO. : May. 21 2842 11:58AM Pr? Ss. Cal f, 20, fs conve, (1) Chi as * tog a Pr & t a st: L zd Or fle Jog S Py = 60.0 om Lo Phe eye Pen He feet lene murh be FOem in back ol He oe cord Lenp ar CO RLS =e POO we beet (QP ot He Lot te a = PE Oem. $°¢c+t ot htak @ : rey G0 =3h £2 46.7 cm “) Ce\ Conmn tau £70 Q voy CAV (Ts (“at (- a) vis 2 BRA 2 Garadre . 935) (Loe eda (el Sma N00, cb oe muerte. Alas quel reeion tht Lat bens produces an uperht weterl mars ra second fans preducer reel converted mare (D)