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Unformatted text preview: rosen (arr956) – Homework 07 – Chiu – (58295) 1 This printout should have 24 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 3) 10.0 points 2 . 6 MΩ 1 . 3 μ F 9 . 7 V S The switch is closed at t = 0. Find the charge on the capacitor at 2 . 32 s. Answer in units of μ C. 002 (part 2 of 3) 10.0 points Find the current in the resistor at 2 . 32 s. Answer in units of μ A. 003 (part 3 of 3) 10.0 points At 2 . 32 s the current in the resistor is I (Part 2) and the charge on the capacitor is q (Part 1). What is the power delivered by the battery? Answer in units of μ W. 004 10.0 points Suppose a new particle is discovered, and it is found that a beam of these particles passes undeflected through “crossed” electric and magnetic fields, where E = 452 V / m and B = 0 . 00125 T. If the electric field is turned off, the particles move in the magnetic field in circular paths of radius r = 1 . 6 cm. Determine q m for the particles from these data. Answer in units of C / kg. 005 (part 1 of 2) 10.0 points An electron is projected into a uniform mag netic field given by vector B = B y ˆ + B z ˆ k , where B y = 5 T and B z = 1 . 7 T. The magnitude of the charge on an electron is 1 . 60218 × 10 19 C . y z x v = 4 × 10 5 m / s electron 5 T 1 . 7 T B Find the direction of the magnetic force when the velocity of the electron is v ˆ k , where v = 4 × 10 5 m / s. 1. hatwide F = ˆ ı 2. hatwide F = − ˆ ı 3. hatwide F = ˆ k 4. hatwide F = 1 √ 2 parenleftBig ˆ k − ˆ parenrightBig 5. hatwide F = − ˆ 6. hatwide F = 1 √ 2 parenleftBig ˆ − ˆ k parenrightBig 7. hatwide F = − ˆ k 8. hatwide F = 1 √ 2 parenleftBig ˆ + ˆ k parenrightBig 9. hatwide F = ˆ 006 (part 2 of 2) 10.0 points What is the magnitude of this force? Answer in units of N. 007 (part 1 of 2) 10.0 points Consider the passage of a horizontal electron beam through a velocity selector, where the electric field vector E is pointing downward and the magnetic field vector B is pointing into the paper. Denote the critical speed v c at which the hor izontal electron beam is not deflected. rosen (arr956) – Homework 07 – Chiu – (58295) 2 v E B Based on the Lorentz force law, what is the critical speed v c ?...
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 Spring '08
 Turner
 Physics, Electron, Work, Magnetic Field

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