Exam3_2003Spr_Solutions

Exam3_2003Spr_Solutions - Physics 8.02 TEST 3 Mashup...

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Physics 8.02 TEST 3 Mashup Solutions Spring 2003 PLEASE DETACH THIS SHEET AND USE AT YOUR CONVENIENCE Some (possibly useful) Relations: F = 1 4 πε o q 1 q 2 r 2 E = q 4 o r 2 ˆ r observer to source from points r ˆ = surface closed o inside Q ε dA E outside to inside from points dA = = b a a b b to a from moving V V V ds E j i q q U ij j i o j i = ∑∑ , 4 2 1 r r C Q V U = 1 2 C V 2 = Q 2 2C d A o plate parallel κ = C τ = RC V = i R L L R A A ρ σ == P joule = i V = i 2 R = V 2 /R 2 ˆ 4 o q r µ π × = vr B 2 ˆ 4 o I r × = ds r dB F = q v × B ext ext I = × dF ds B ττ = µµ × B NIA = through o I = ds B = dA B ds E dt d ε = N d φ B dt L = N B i ε = L di dt = 0 dA B / L R = U L = 1 2 L i 2 u B = | B | 2 2 0 T = 2 π ω = 1 f if ε (t) = ε m sin( ω t ), then i (t) = i m sin( ω t - φ ), where i m = ε m R 2 + ω L – 1 ω C 2 1/2 and tan φ = ω L – 1 ω C R

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8.02T 1 Problem 1: Five Conceptual Questions (25 points) Circle your choice for the correct answer to the five questions below. A. The graph shows the current versus the voltage in a driven RLC circuit at a given driving frequency. In this plot 1. The current leads the voltage by about 45 degrees. 2. The current lags the voltage by about 45 degrees 3. The current and the voltage are in phase 4. The current and the voltage are about 90 degrees out of phase B: An ideal battery is hooked to a light bulb with wires. A second identical light bulb is connected in parallel to the first light bulb. After the second light bulb is connected, the light from the first bulb compared to when only one bulb was connected 1. is about four times as bright 2. is about two times as bright 3. stays the same 4. is about half as bright
8.02 2 C:

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Exam3_2003Spr_Solutions - Physics 8.02 TEST 3 Mashup...

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