PHYS UN1402 Chapter Notes - Chapter 21: Field Line, Electric Dipole Moment, Electric Field

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27 Apr 2020

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Electric current lil = rate at which i - Coulomb"s law: describes electrostatic force between two charged particles. Given particles of charges q , and q. separated by distance r , at rest , magnitude of force acting on each due to the other is : 19. 11. 91 ( coulomb "s law : permittivity constant. F acting on q . due to q . Directed away from q . ( same sign ) Shell theories: charged particle outside a shell is attracted or repelled as if the shell "s charge were concentrated as a particle at its center . Charged particle inside a shell with charge uniformly distributed on its surface has no net force acting on it due to shell. "electric field e at any point defined in terms of the electrostatic force i exerted on positive test charge go . is.

Related Questions

Consider an electric dipole whose dipole moment (a vector pointing from the negative charge to the positive charge) is oriented at an angle with respect to the y-axis. There is an external electric field of magnitude E (independent of the field produced by the dipole) pointing in the positive y-direction. The positive and negative ends of the dipole have charges +q and -q, respectively, and the two charges are a distance d apart. The dipole has a moment of inertia I about its center of mass. It will help you to imagine that the dipole is free to rotate about a pivot through its center.

A) What is the net force that the dipole experiences due to the electric field?

B) What is , the magnitude of the torque that the electric field exerts about the center of mass of the dipole?

C) Using the above result, find the potential energy associated with the dipole's orientation in the field as a function of the angle shown in the figure. Take the zero of the potential to occur when the dipole is at angle ; that is , .

D) In terms of the dipole moment , What is the expression for the torque on a dipole in the field ?

E) In terms of the dipole moment, What is the expression for the potential energy of a dipole in the field?

redmammoth521

1-Which of the following general statements for any electric fieldlines are true? Give ALL correct answers in alphabetical order,without spaces, i.e., B, AC, BCD...

A) E-field lines do not begin or end in a charge-free region(except at infinity).
B) A point charge q, released from rest will initially move alongan E-field line.
C) E-field lines may cross.
D) E-field points outward from + charges.
E) E-field lines make circles around - charges.
F) Where the E-field lines are denser the E-field must bestronger.

2-a-Three charges, Q1, Q2, and Q3 are located in a straight line.The position of Q2 is 0.246 m to the right of Q1. Q3 is located0.136 m to the right of Q2. The force on Q2 due to its interactionwith Q3 is directed to the (Give ALL correct answers, i.e., B, AC,BCD...)

A) right if the two charges are negative.
B) left if the two charges have opposite signs.
C) right if the two charges have opposite signs.
D) left if the two charges are negative.
E) left if the two charges are positive.

b-In the above problem, Q1= 1.90x10-6 C, Q2=-3.22 x10-6 C, and Q3=3.18 x10-6 C. Calculate the total force on Q2. Give with the plussign for a force directed to the right.

c-Now the charges Q1= 1.90x10-6 C and Q2= -3.22 x10-6 C are fixedat their positions, distance 0.246 m apart, and the charge Q3= 3.18x10-6 C is moved along the straight line. For what position of Q3relative to Q1 is the net force on Q3 due to Q1 and Q2 zero? Usethe plus sign for Q3 to the right of Q1.

PHYS UN1402 Chapter Notes - Chapter 21: Field Line, Electric Dipole Moment, Electric Field

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