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Test 3 b - PHY 1923 ENGINEERING PHYSICS 11 EXAM 3 ® Roster...

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Unformatted text preview: PHY 1923 ENGINEERING PHYSICS 11 EXAM 3 ® Roster Number: N e: f 5M" _—.n—-.-—- “1:29.11x10'31kg, mp: 1.67:: 10 ‘1” k3, el==l.60:rc10'l9 C 1. A uniform magnetic field B. with magnitude 3.0 T, points into page. An electron with _ ')a Speed of 2.0 x 107 m/s initially moves upward. (a) Find the m and the slim ( 1 0 P19 of the magnetic force on the electron w/f . Ans. Magnitude 0). 6 W o N Direction: M (5?“ ) ( E7973.j (b) Describe the motion of the electron in less than 15 words. l (9997 Tim @450}er W W £~ Mae/C - datum (El W CWngW£J . 2. Two parallel long wires carry the same current I in the same directions. Is the force attractive or repulsive? (9H? 3 E?" _ 63 (Va rfiflflfl 3. A circular conductor of radius 6.0 cm is placed in a magnetic field so that its plane makes an angle of 60 degrees with the magnetic field. If the magnetic field changes from 5.0 T to 3 0 Tin 2.0 5, find the emf induced in the conductor. 4% fl A51; _. ALBA (mot) _ Q: TV J A“? P_ At “£1510 - —— Awe 435' a ”I Goo-~56": 90° ._ . At ‘5‘ T r ’- ntaoéwficwwo”) Lari; we my) 4. A bar magnet is moving away item a wire loop as shown below. What is the direction of the current as seen fi'om top. Choose your answer below. (W3 l 7;}? WW4 mwiafaémsité, n m.» Nfitwwn F5 ”[55 WWW" )1 A. clockwise @ ft) ' ‘BIHWCw/l S. A rectangular coil cam'es a current. Ifa magnetic field of magnitude is applied, (a) at what angle with the plane of the loop, is the magnitude of the torque acting on the loop minimum? (b) maximum? (WT?) Answers: (a) (f0 0 (b)-__.___.___.0 0 6. A long cylindrical conductor with radius R carries a current I. The current is uniformly distributed over the cross-sectional area of the conductor. (a) The direction of the magnetic field seen from the left end of the conductor is ) cloc ' (B) counterclockwise ( 5 fl?) ' (b) Using Ampere’s law, find the magnetic field at a distance r from the conductor axis for a point inside (KR). (Hint: Find the current within the circle of radius :- when KR.) 7’. Using Biot-Savart law, (a) find the direction and (b) the magnitude of the magnetic field produced at the center of a loop of wire of radius R carrying a current I. You must clearly draw the current segment d1" and the radial unit vector? . ( 9 59)] 9 )(a) The direction of the magnetic field is: A) into page, (B) out of page. A ‘ I W_ {0T- fix)" Lb) AB’ZEF' R1 4—7? R1 :1 #2:; ”(I 1 477K 40: TR fig—H {gt-u ”— ' 2‘ "P 2 (5: [00%; éfiffifip LFITR? R to a uniform 3.0 T magnetic field. The bar rides on parallel metal rails. The two rails are connected with a resistor of resistance 300 ohms. (a) What is the emfinduced in the circuit? ( 5- ,773) x ‘T' > (b) What is the direction of the current? Draw it in the figure. ( ,5 P J $11 part of the bar has a higher potential? Circie your answer: t g f if ) A 8. A 0.50-m-long metal bar is pulled to the left at a steady speed of 5.0 mfs, perpendicular O . B. bottom C. There is no potential difference across the bar. (0) at is the power needed to move the bar at the same speed? ( / 0 Pf 5 ) (3. o r )1 afooflgflo/rf {"1 f..— 2 my. , (Lift/U Fe————-——-—'——T‘ ...
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