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2212 GPS W4 - ....

....
Course

social psychology (pysc105)

22 Documents
Students shared 22 documents in this course
Academic year: 2023/2024
Uploaded by:
Anonymous Student
This document has been uploaded by a student, just like you, who decided to remain anonymous.
West Virginia University at Parkersburg

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Physics 2212 GPS Week 4

Problem #

Two identical dipoles are oriented on the x-axis as shown in the diagram below. Each dipole consists of two charges +q and −q, held apart by a rod of length s, and the center of each dipole is a distance d from the origin.

A. If q = 5 nC, s = 1 × 10 − 3 m, and d = 3 × 10 − 2 m, what is the electric field at the origin? Express your answer as a vector in component form.

B. Determine where would you place a single electron so that the net electric field at the origin is zero?

Problem #

A tiny scrap of paper is suspended motionless below a plastic pen that carries a net charge of Q. Focus on a single carbon atom in the scrap of paper. Suppose that the center of the outer electron cloud (with a charge of -4e) of this carbon atom shifts a distance s when the carbon atom is polarized by the pen.

A. Which statement best describes the net force on the carbon atom? Circle one.

  • The net force is upward.
  • The net force is zero.
  • The net force is downward.

B. Which forces act on the carbon atom Circle all that apply.

  • The electric force of the pen on the paper.
  • The electric force of the pen on the carbon atom.
  • The electric force of the paper on the pen.
  • The electric force of the carbon atom on the pen.
  • The gravitational force of the Earth on the paper.
  • The gravitational force of the Earth on the carbon atom.
  • The contact force of the table on the paper.
  • The contact force of the table on the carbon atom.

Problem #

The center of a neutral solid metal sphere of radius R is located atr ⃗ s =< d, d, 0 >. An electric dipole is held fixed at the origin so that the the dipole moment points in the direction ˆp =< − 1 /

√

2 , 1 /

√

2 , 0 > with magnitude |qs|. The sphere is far from the dipole d >> s and enough time has passed for the system to reach equilibrium.

A. On the diagram, sketch the approximate polarization of the metal sphere.

B. Determine the net electric field at the center of the metal sphere. Briefly explain how you know this.

C. Calculate the electric field (magnitude and direction) at the center of the sphere due to the polarization of the sphere.

D. How would your answer to the previous problem change if the dipole had been position to point in the direction ˆp =< 1 /

√

2 , 1 /

√

2 , 0 >?

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2212 GPS W4 - ....

Course: social psychology (pysc105)

22 Documents
Students shared 22 documents in this course

University: West Virginia University at Parkersburg

Was this document helpful?
Physics 2212 GPS Week 4
Problem #1
Two identical dipoles are oriented on the x-axis as shown in the diagram below. Each dipole consists of two charges
+qand −q, held apart by a rod of length s, and the center of each dipole is a distance dfrom the origin.
A. If q= 5 nC, s= 1 ×10−3m, and d= 3 ×10−2m, what is the electric field at the origin? Express your
answer as a vector in component form.
B. Determine where would you place a single electron so that the net electric field at the origin is zero?

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