PHYS 6B Chapter Notes - Chapter 17: Electric Potential Energy, Test Particle, Electric Field

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25 Aug 2016

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17-2 electric potential energy changes when a charge moves in a electric field: work done by gravity is, the change in gravitational potential energy a. i, electric potential energy in a uniform field a. b. b. i. Delta u: the change in electric potential energy for an object of charge q that moves in a uniform electric field e b. ii. W: the negative of the work done on the object by the electric force b. iii. b. iv. d: the straight line-displacement of the object theta: angle between the displacement and the direction of the electric field. If q is positive: the force on the charged object is in the same direction as the electric field b. v. b. v. 1. If the charges moves opposite to the electric field b. v. 1. a. b. v. 1. b. If the two charges have opposite signs, you would have to do negative work to oppose the attractive electric force that pulls the two charges together c. i. 1.

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A point charge q = +40.0 μC moves from A to B separated by a distance d = 0.180 m in the presence of an external electric field of magnitude 275 N/C directed toward the right as in Figure P16.16. Find (a) the electric force exerted on the charge, (b) the work done by the electric force, (c) the change in the electric potential energy of the charge, and (d) the potential difference between A and B.

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A charge q that moves between two points A and B, and has anelectric force acting on it ( and perhaps several other forces) haswork W done on it by the electric force. The electrostatic force isconservative and so we can define a change in electric potentialenergy, Delta U = -W. We defined electric field using the relationF^^\-> = q E^^\->, and in a similar way we define electricpotential commonly called voltage as
Delta V = V_B - V_A = -W/q=(Delta U)/q or equivalently q Delta V =q (V_B - V_A) = -W=Delta U

A ball has mass 3.0 Âµg and charge -6 nC moves from point A to pointB. It has the same speed at points A and B, and the work done bythe electric field during the move is -1.5 mJ.
(a) What is the change in electric potential energy of the ball?1
(b) What is the change in voltage between points A and B? 2
(c) At which point does the ball have a higher electric potentialenergy?
(d) Which point has the higher voltage?
(e) Has the kinetic energy of the ball changed?

A point charge q = +38.0 ÂµC moves from A to B separated by adistance d = 0.172 m in the presence of an external electric fieldof magnitude 259 N/C directed toward the right as in the followingfigure.

(a) Find the electric force exerted on the charge.
magnitude 1 N
direction 2 ---Select--- toward the right toward the left Themagnitude is zero.

(b) Find the work done by the electric force.
3 J

(c) Find the change in the electric potential energy of thecharge.
4 J

(d) Find the potential difference between A and B.
VB - VA = 5 V

PHYS 6B Chapter Notes - Chapter 17: Electric Potential Energy, Test Particle, Electric Field

PHYS 6B Full Course Notes

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Physics: Principles with Applications

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