Midterm1[Summer_2004-2005]

Midterm1[Summer_2004-2005] - The American University of...

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The American University of Sharjah College of Arts and Sciences Physics Department PHY102-General Physics II Exam 1 (15 %) June 18, 2005 5:00 p.m. to 6:15 p.m. Write your name and ID in ink. Name: ………………………….. ID: ………………………… Instructors : ± Asad Hasan ± Nasser Hamdan ± Said Sakhi Problem Maximum score Your score 1 7 2 10 3 7 4 6 Total 30 Fundamental Constants: Permittivity of free space : ε 0 = 8.85 × 10 -12 C 2 /N m 2 Coulomb constant: K e = 9 × 10 9 N m 2 /C 2 Elementary charge : 1.6 × 10 -19 C Electron mass: m = 9.1 × 10 -31 kg
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1) Three charges ( q 1 = 25 n C, q 2 = – 80 n C, q 3 = 20 n C ) are at the corners of a right-angle triangle as shown in the figure (a) Calculate the electric field vector, net E r , due to q 1 , q 2 at the position of q 3 . (b) Determine the net force vector, net F r , on q 3 . 5 cm 3 cm 4 cm q 1 q 2 q 3 E 1 E 2 θ θ θ x y 5 4 ) sin( 5 3 ) cos( = = θ θ 9 9 1 5 1 2 2 2 13 9 9 2 5 2 2 2 2 23 5 1 1 1 5 2 2 2 1 2 (9 10 )(25 10 ) 2.5 10 / (3 10 ) (9 10 )(80 10 ) 4.5 10 / (4 10 ) sin( ) cos( ) (2 1.5 ) 10 / cos( ) sin( ) ( 2.7 3.6 ) 10 / ( 7 51 K q C E N C r m K q C E N
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  • Spring '14
  • KathrynLynch
  • English, Electric charge, electric field vector

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