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Phy 102 Sample Test 1 2005

# Phy 102 Sample Test 1 2005 - Dr Huerta Phy 102 Sample Test...

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Dr. Huerta Phy 102 Sample Test 1 Spring 2005 Spring Semester 2005, Sections S and T FORMULAE SHEET Vectors: Unit vectors: x-axis: ˆ x ˆ i , y-axis: ˆ y ˆ j A · B = | A || B | cos θ = | A | B A = | B | A B , | A × B | = | A || B | sin θ , | A | = A 2 x + A 2 y , direction of A × B is perpendicular to both vectors by right hand rule. Electric Fields: e = 1 . 6 × 10 - 19 C, m e = 9 . 1 × 10 - 31 kg, m p = 1 . 67 × 10 - 27 kg, k = 1 4 π 0 = 9 × 10 9 N · m 2 C 2 . E = kQ r 2 , F q = qE, V = kQ r , | E | = | Δ V Δ s | , Δ V = - E · Δ r, E = σ 2 0 for a sheet of charge . U q = qV, KE = 1 2 mv 2 . Potential Energy and Torque for an Electric Dipole: U = - pE cos θ, | τ | = pE sin θ. Capacitance: Q = CV, C = κ 0 A d , U = 1 2 CV 2 = Q 2 2 C . Circuits: i = Δ q Δ t , V = iR, R = ρ L A , P = V i, P R = i 2 R, E rms = E 2 resistors in series: R S = R 1 + R 2 , resistors in parallel: 1 R P = 1 R 1 + 1 R 2 Physics 102 Sample Test 1 Spring 2005

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Dr. Huerta Phy 102 Sample Test 1 Spring 2005 [1.] An electric field of 10 6 V/m points due north at a certain spot. What are the magnitude and direction of the force that acts on an electron at this spot? [A] Insufficient information because it depends on the electron’s velocity. [B] 1 . 6 × 10 - 13 N to the north [X] 1 . 6 × 10 - 13 N to the south [D] 6 . 25 × 10 24 N to the north [E] 6 . 25 × 10 24 N to the south [2.] A plastic rod acquires a negative charge of
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Phy 102 Sample Test 1 2005 - Dr Huerta Phy 102 Sample Test...

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