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Phy 121 - Sample Ex2

Phy 121 - Sample Ex2 - EXAM 2 A PHYS 121 SUMMER 2003 The...

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EXAM 2 A PHYS 121 SUMMER 2003 ________________________________________________________________________________________________ The exam is closed book and closed notes. Make sure you put your name on the SCANTRON form. e = 1.6x10 -19 C; m e = 9.11x10 -31 kg k = 8.99x10 9 Nm 2 /C 2 ; k = 1 4 0 πε ; ε 0 = 8.85x10 -12 C 2 / Nm 2 ; F = k q q r 1 2 2 ; E = k q r 1 2 ; Area = π r 2 1 m = 1000 mm 1 mega (1M ) = 10 6 U = -W = q V V = - E d point charge, sphere: V = k r q 1 charged plane: V = V 0 - Ex parallel: C eq = C 1 +C 2 +…C n j = (ne) v d E = ρ J ρ - ρ 0 = ρ 0 α (T - T 0 ) P = iV P = i 2 R series: R = R 1 + R 2 +..R n charging: Q = CV (1-e -t/RC ), V C = V (1-e -t/RC ), i = i 0 (e -t/RC ), V R = i 0 R (e -t/RC ), discharging: Q = Q 0 e -t/RC , i = i 0 (e -t/RC ), V c = V 0 (e -t/RC ), V R = i 0 R (e -t/RC ), 1. When electron moves from A to B along an electric field line, the electric filed does 8 x 10 -19 J work on it. What is the electric potential difference between V B - V A ? A. 1 V B. 3 V C. 5 V D. 7 V E. 9 V 2. Four charges q = 4nC form a square, 20 cm on a side, as shown in figure below. What is the potential of electric field at the center of the square ? A. 360 V B. 420 V C. 510 V D. 640 V E. 700 V

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Phy 121 - Sample Ex2 - EXAM 2 A PHYS 121 SUMMER 2003 The...

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