Phy 121 - Sample Final

# Phy 121 - Sample Final - FINAL EXAM PHYS 121 VERSION C...

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FINAL EXAM PHYS 121 VERSION C SUMMER 2003 ________________________________________________________________________________________________ The exam is closed book and closed notes. 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 ; μ 0 = 1.26x10 -6 Tm/A F = k q q r 1 2 2 ; E = k q r 1 2 ; Area = π r 2 F = qE 1 m = 1000 mm 1 m = 100 cm 1 mega (1M ) = 10 6 parallel: C eq = C 1 +C 2 +…C n U = -W = q V V = - E d point charge, sphere: V = k r q 1 charged plane: V = V 0 - Ex j = (ne) v d j = i/A E = ρ J ρ - ρ 0 = ρ 0 α (T - T 0 ) P = iV P = i 2 R = V 2 /R series: R eq = R 1 + R 2 +..R n RC-circuit: charging: Q = Q 0 (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 ), F = qvxB F = iLxB v = E/B qvxB = mv 2 /R τ = μ xB μ = NiA B straight wire = μ 0 I/2 π R B arc = μ 0 I θ /4 π R B loop = μ 0 I/2R B sem = μ 0 I/4R B solenoid = μ 0 In μ 0 = 1.26x10 -6 Tm/A Flux: Φ = B A emf = -d Φ /dt emf sel-induced = -Ldi/dt emf max = NAB ϖ AC circuit: emf = E m sin ϖ t I = I m sin( ϖ t- ϕ ) X L = ϖ L X C = 1/ ϖ C I m = V m /Z tan ϕ = (X L - X C) )/R P avg = I rms V rms cos ϕ cos ϕ = R/Z 1. Two point charges are arranged as shown. In which region could a third charge +2 C be placed so that the net electrostatic force on it is zero? A) I only B) I and II only C) III only D) I and III only E) II only A Q = σ 0 2 E ε σ = r 2 E 0 πε λ = ε = = Φ 0 encl q EdA - = ds E V 2 2 CV 2 1 V C C 2 Q U = = = d A C 0 ε = V Q C = d A C 0 κε = 1 n 2 1 eq C 1 ... C 1 C 1 C : series - + + = dt dQ i = A i J = i V R = d V E = d V E = A L R ρ = 1 n 2 1 eq R 1 ... R 1 R 1 R : parallel - + + = 2 V V max rms = 2 I I max rms = 2 C L 2 ) X X ( R Z - + = LC 1 0 = ϖ

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2. A 5-nC charge is placed at the origin, a 6 -nC charge is placed 0.3 m from the origin on the x axis, and a third -3-nC charge is placed 0.1 m from the origin on the y axis. The magnitude of the force on the charge at the origin is A. 0.13x10 -6 N B. 0.34x10 -6 N C. 5.68x10 -6 N D. 8.90x10 -6 N E. 13.8x10 -6 N 3. A spherical conducting shell has charge q=6pC.
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Phy 121 - Sample Final - FINAL EXAM PHYS 121 VERSION C...

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