Exam+1+--+Fall+2005+--+Blank

# Exam+1+--+Fall+2005+--+Blank - Physics 240 Fall 2005: Exam...

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1: Imagine four identical metal spheres; A, B, C, and D. Sphere A has an initial charge of +12Q, sphere B of -14Q, and sphere C of +16Q. The initially neutral sphere D is touched to sphere A, then they are pulled apart. Sphere D is then touched to sphere B, and they are pulled apart. Finally sphere D is touched to sphere C, and they are pulled apart. What is the final charge on sphere D? a) 8Q b) 6Q c) 3.5Q d) -6Q e) 0 2: Consider an infinitely long cylinder with radius R. The cylinder has a uniform charge density # (measured in C/m 3 ). What is the magnitude of the electric field at a point r which is inside the cylinder? a) 0 2 ! #" r b) 0 2 # r c) 0 d) 0 2 2 r e) 0 2 r R r
3: Because charge can flow freely in them, conductors exhibit a variety of special properties. Which of the following statements about conductors in electrostatics is false? a) The electric potential everywhere inside a conductor must be zero b) The total electric charge on a conductor may be positive or negative c) The electric field inside a conductor is everywhere zero d) Any excess positive or negative charge inside a conductor must be distributed on its surface e) The electric field just outside the conductor is directed perpendicular to its surface 4: The electric field inside a parallel plate capacitor is 5x10

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## This note was uploaded on 10/07/2010 for the course ENGINEERIN 240 taught by Professor Gidley during the Spring '10 term at University of Michigan.

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Exam+1+--+Fall+2005+--+Blank - Physics 240 Fall 2005: Exam...

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