# Chapt_25 - University Physics(Prof David Flory Chapt_25...

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Unformatted text preview: University Physics (Prof. David Flory) Chapt_25 Sunday, February 03, 2008 Page 1 Name: __________________________ Date: _____________ 1. An electron moves from point i to point f , in the direction of a uniform electric field. During this displacement: A) the work done by the field is positive and the potential energy of the electron-field system increases B) the work done by the field is negative and the potential energy of the electron-field system increases C) the work done by the field is positive and the potential energy of the electron-field system decreases D) the work done by the field is negative and the potential energy of the electron-field system decreases E) the work done by the field is positive and the potential energy of the electron-field system does not change 2. The potential difference between the ends of a 2-meter stick that is parallel to a uniform electric field is 400 V. The magnitude of the electric field is: A) zero B) 100 V/m C) 200 V/m D) 400 V/m E) 800 V/m Write the letter for the correct answer on the answer sheet. Write clearly. University Physics (Prof. David Flory) Chapt_25 Sunday, February 03, 2008 Page 2 3. In separate experiments, four different particles each start from far away with the same speed and impinge directly on a gold nucleus. The masses and charges of the particles are particle 1: mass m , charge q particle 2: mass 2 m , charge 2 q particle 3: mass 2 m , charge q /2 particle 4: mass m /2, charge 2 q Rank the particles according to the distance of closest approach to the gold nucleus, from smallest to largest. A) 1, 2, 3, 4 B) 4, 3, 2, 1 C) 3, 1 and 2 tie, then 4 D) 4, 1 and 2 tie, then 1 E) 1 and 2 tie, then 3, 4 4. The electric field in a region around the origin is given by ˆ ˆ ( i j) E C x y = + G , where C is a constant. The equipotential surfaces in that region are: A) concentric cylinders with axes along the z axis B) concentric cylinders with axes along the x axis C) concentric spheres centered at the origin D) planes parallel to the xy plane E) planes parallel to the yz plane 5. If 500 J of work are required to carry a charged particle between two points with a potential difference of 20 V, the magnitude of the charge on the particle is:...
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Chapt_25 - University Physics(Prof David Flory Chapt_25...

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