practice_final

# practice_final - Name: _ Class: _ Date: _ ID: A w9final...

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Name: ______________________ Class: _________________ Date: _________ ID: A 1 w9final Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. ____ 1. If C = 36 μ F, determine the equivalent capacitance for the combination shown. a. 24 μ F b. 28 μ F c. 36 μ F d. 32 μ F e. 20 μ F ____ 2. What is the potential difference between points a and b? a. 24 V b. 27 V c. 6 V d. 8 V e. 12 V ____ 3. Consider two charged spheres, one with charge +2 C and the other with 2 C. A proton (a positively charged particle) is at the point halfway between the spheres. What is not zero? a. the dipole moment of the proton b. the work to move the proton from infinity to that point c. all of the four above are zero d. the force on the proton e. the potential energy of the proton

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Name: ______________________ ID: A 2 ____ 4. A solid conducting sphere of 10 cm radius has a net charge of 20 nC. If the potential at infinity is taken as zero, what is the potential at the center of the sphere? a. 36 μ V b. 360 μ V c. 1.8 × 10 3 V d. =1.8 × 10 4 V e. >1.8 × 10 4 V ____ 5. An initially uncharged hollow metallic sphere with radius of 5 cm has a small object with a charge of +10 μ C carefully placed at the center of the sphere through a hole in the latter's surface. With the charge in place, what charge is now present on the outside surface of the sphere? a. +10 μ C b. +4 000 μ C c. zero d. 10 μ C e. 4000 μ C ____ 6. A proton moving at 3.0 × 10 4 m/s is projected at an angle of 30 ° above a horizontal plane. If an electric field of 400 N/C is acting down, how long does it take the proton to return to the horizontal plane? (Hint: Ignore gravity. m proton = 1.67 × 10 27 kg, q proton = 1.6 × 10 19 C) a. 1.7 × 10 6 s b. 7.8 × 10 7 s c. 1.0 × 10 5 s d. 3.9 × 10 6 s e. 7.8 × 10 6
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## This note was uploaded on 12/16/2010 for the course PHYS 1B PHYS 1B taught by Professor Levineherbert during the Spring '10 term at UCSD.

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practice_final - Name: _ Class: _ Date: _ ID: A w9final...

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