PHYS 115 Midterm: Phys115Fall2015Exam2A

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turquoisegnu128

31 Jan 2019

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Physics

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PHYS 115

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All

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Last: multiple choice (15 questions, 5 points each, two identical conducting spheres, one that has an initial charge +q, the other initially uncharged, are brought into contact. What is the new charge on each sphere: q, q/2, zero, +q/2, +q. A point charge q and q are anchored at (x, y) = (-l/2, 0) and (x, y) = (l/2, 0), respectively. The electric field due to these charges at a field point p on the y-axis is purely in the positive y-direction as shown. Last: a single point charge is placed at the center of an imaginary cube that has 0. 15-m-long edges. side = -2500 nm2/c. The electric flux out of one of the cube"s sides is the center: -3. 0 10-9 c, -2. 2 10-8 c, -1. 3 10-7 c, -9. 8 10-7 c. 5. 9 10-6 c: a uniform electric field of magnitude 2. 8 104 n/c makes an angle of 55 with a plane surface of area 0. 016 m2.

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 = â240 V, to point B, where the electric potential is VB =â360 V. What is the change in the electric
potential energy?
(a) 1.92Ã10â17 J (b) 2.04Ã10â17 J (c) 5.75Ã10â17 J (d) 8.98Ã10â17 J(e) 1.05Ã10â16 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.

PHYS 115 Midterm: Phys115Fall2015Exam2A

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