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PHYS 2002 Chapter : Physics 2002 Practice Exam

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azuremammoth471
15 Mar 2019
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LSU
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Physics
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PHYS 2002
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A conducting sphere has a net charge of 6. 4 10 17 c. what is the approximate number of excess electrons on the sphere: 500, 300, 400, 100, 200. Three charges are positioned as indicated in the figure. What are the horizontal and vertical components of the net force exerted on the +15 c charge by the +11 c and +13 c charges? vertical. A small sphere of mass 2. 5 10 5 kg carries a total charge of 6. 0 10 8 c. the sphere hangs from a silk thread between two large parallel conducting plates. The excess charge on each plate is equal in magnitude, but opposite in sign. If the thread makes an angle of 30 with the positive plate as shown, what is the magnitude of the charge density on each plate: 1. 0e-9, 2. 1e-8, 4. 2e-8, 2. 5e-9, 5. 2e-9. The figure shows the electric field lines in the vicinity of two point charges.

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Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

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Related Questions


1.Two uncharged, conducting spheres, A and B, are held at rest oninsulating stands and are in contact. A positively charged rod isbrought near sphere A. While the rod is in place, the two spheresare separated. How will the spheres be charged, if at all, afterthey are separated?
Sphere A Sphere B
(a) positive positive
(b) positive negative
(c) negative positive
(d) negative negative
(e) zero zero

2. A charged conductor is brought near an uncharged insulator.Which one of the following statements is true?
(a) Both objects will repel each other.
(b) Both objects will attract each other.
(c) Neither object exerts an electrical force on the other.
(d) The objects will repel each other only if the conductor has anegative charge.
(e) The objects will attract each other only if the conductor has apositive charge.

3. An electron is moved from point A, where the electric potentialis VA = –240 V, to point B, where the electric potential is VB =–360 V. What is the change in the electric
potential energy?
(a) 1.92×10–17 J (b) 2.04×10–17 J (c) 5.75×10–17 J (d) 8.98×10–17 J(e) 1.05×10–16 J

4. A -2q charge is located a distance d to the right of a +4qcharge, along the x
axis. At which point (or points) along the axis does the electricfield go to zero? To
solve this problem, consider an observer at point P, which is anarbitrary distance x from the +4q charge. Find the value (orvalues) for x (in terms of the separation distance d) where thetotal electric field vanishes.
(a) The electric field is never zero in the vicinity of thesecharges.
(b) The electric field is zero at x = -0.328d.
(c) The electric field is zero at x = +4.22d.
(d) The electric field is zero at both x = -2.26d and x =+2.26d.
(e) The electric field is zero at x = +3.41d.

5. point A is a distance L away from a point charge Q. Point B is adistance 4L away from Q. What is the ratio of the electrostaticpotential at B to that at A, i.e., what is VB/VA?
(a) 1/16
(b) 1/9
(c) 1/4
(d) 1/3
(e) can not be determined without specifying Q and L

6. Which one of the following statements best explains why it ispossible to define an electric potential
in a region of space that contains an electric field?
(a) Work must be done to bring two positive charges closertogether.
(b) Like charges repel one another and unlike charges attract oneanother.
(c) A positive charge will gain kinetic energy as it approaches anegative charge.
(d) The work required to bring two charges together is independentof the path taken.
(e) A negative charge will gain kinetic energy as it moves awayfrom another negative charge.

For the configuration from Ch. 24 pr 51, suppose a= 5 cm, b= 20 cm, and c= 25 cm. Suppose the electric field at a point 10 cm from the center is measured to be 3.6 x 10^3 N/C radially inward and the electric field at a point 50cm from the center is of magnitude 200 N/C and points radially outward. From this information, find a) the charge on the insulating sphere, b) the net charge on the hollow conducting sphere, c) the charge on the inner surface of the hollow conducting sphere and d) the charge on the outer surface of the hollow conducting sphere.