Practice_Exam

# Practice_Exam - charges on the block itself is 1 0 N/C 2...

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1 Problem 1 The magnitude of the electric field due to a disk of radius 3 m and a uniformly distributed positive charge is measured to be 150 N/C at a location in the air 6 mm from the center of the disk, along a line perpendicular to the disk. Approximately what is the magnitude of the electric field due to the disk at a location 9 mm from the center of the disk, on the same line? 1. 44 N/C 2. 67 N/C 3. 100 N/C 4. 150 N/C 5. 225 N/C 6. 338 N/C 7. 506 N/ C Problem 2 The magnitude of the total charge Q on the disk in problem 2 is 1. 5.1 × 10 8 C 2. 2.5 × 10 8 C 3. 7.6 × 10 8 C 4. 3.8 × 10 8 C 5. Not enough information given to determine Q

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2 Problem 3 A very thin spherical plastic shell of radius 15 cm carries a uniformly distributed negative charge of -8 nC on its outer surface. An uncharged solid metal block is placed nearby. The block is 10 cm thick, and it is 10 cm away from the surface of the sphere. The magnitude of the electric field at the center of the metal block due only to the
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Unformatted text preview: charges on the block itself is: 1. 0 N/C 2. 3200 N/C 3. 1152 N/C 4. 800 N/C 5. 1800 N/C Problem 4 In the diagram below, A and B are identical metal blocks. What is the final charge of block B? There are no external electric fields. 1. +6 nC 2. +3 nC 3. 0 nC 4.-3 nC 5.-6 nC 6. not enough information 3 Problem 5 You stand at location A, a distance d from the origin, and hold a small charged ball. You find that the electric force on the ball is 0.008 N. You move to location B, a distance 2d from the origin, and find the electric force on the ball to be 0.004 N. What object located at the origin might be the source of the field? 1. A point charge 2. A dipole 3. A uniformly charged rod 4. A uniformly charged ring 5. A uniformly charged disk 6. A capacitor 7. A uniformly charged hollow sphere 8. None of the above...
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## This note was uploaded on 02/05/2012 for the course PHYS 272 taught by Professor K during the Spring '07 term at Purdue.

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Practice_Exam - charges on the block itself is 1 0 N/C 2...

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