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Microsoft Word - Phys240_2010_Practice_Exam1_Kurdak

# Microsoft Word - Phys240_2010_Practice_Exam1_Kurdak -...

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Physics 240 First Practice Exam Kurdak 1. A positive charge + Q is uniformly distributed on the bottom half of a rod and a negative charge ! Q is uniformly distributed on the upper half. What is the direction of the electric field at point P, on the perpendicular bisector of the rod? a) b) c) d) e) 2. A 5.0 μ C charge is placed at the center of a cube. The electric flux in Nm 2 /C through one side of the of the cube is: a) 0 b) 7.1 ! 10 4 c) 9.4 ! 10 4 d) 1.4 ! 10 5 e) 5.6 " 10 5 3. An electron is accelerated from rest through a potential difference of V . The electron’s final speed is proportional to: a) V b) V 2 c) 1 V d) V e) 1 -Q +Q P

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4. The diagram shows the electric field lines due to two horizontal charged metal plates. We conclude that: a) the upper plate is positive and the lower plate is negative b) a positive charge at X would experience the same force if it were placed at Y c) a positive charge at X would experience a greater force than if it were placed at Z d) a positive charge at X would experience a smaller force than if it were placed at Z e) a positive charge at X could have its weight balanced by the electric force 5. Let us consider two parallel line charges with charge densities " 1 and 2 that are separated from each other by a distance a . What is the magnitude of force exerted on a length L of one of the line charges? a) `1 2 L 4 #\$ 0 a 2 b) 2 L 2 0 a 2 c) 2 L 2 0 a d) 2 L 2 4 0 a 2 e) 2 L 2 2 0 a 6. Point charges are located at the two vertices of an equilateral triangle and the electric field is zero at the third vertex. We conclude: a)
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Microsoft Word - Phys240_2010_Practice_Exam1_Kurdak -...

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