PCS 211 Study Guide - Final Guide: Electric Potential, Electric Field, Equipotential

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14 May 2017

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V is the potential energy per unit charge. A common reference point: let v (cid:2) 0 at (cid:1) Vp = (cid:3) e d s (cid:2) (cid:1) Vp is the work required per unit charge to bring a positive test charge from infinity to point p. Change in potential energy by moving charge q0 from point a to. *an equivalent unit for the point b: (cid:2)u = (cid:3)q0 e (cid:1) d s. C = v m: the integral is called a path integral or a line integral, the integral does not depend on the path taken from a and, this is an essential property of conservative forces. *electron volt (ev) is a very common energy unit: the energy. Equipotential surface is a surface on that an electron (or proton) gains or loses by moving through a which the electric potential is the potential difference of 1volt. 1 ev = 1. 60 (cid:2)10-19 c v =1. 60 (cid:2)10-19 j same everywhere.

Related Questions

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?

Amy, standing near a straight road, records the sound of thehorn of a car traveling at a constant speed.

(a) The recorded frequency as a function of the car's positionalong the road for trials at different car speeds is accuratelygraphed below.

Answer Choices: G-Greater Than, L-Less Than, E-Equal To

(i) The distance of Amy from the path in S is ..... in Q.

(ii) The speed in trial S is ..... to that in Q.

(iii) The speed in trial U is ..... that in S.

(iv) The speed in trial T is ..... that in other trials.

(v) The speed in trial R is ..... that in other trials.

(vi) When the car is far away, the average of the frequenciesmoving in and out is ..... the frequency at rest.

(b) Using the data on the figure, calculate the speed of the carin trial S. Use 340 m/s for the speed of sound.

A small mass m slides with negligible friction down an inclineat an angle of 25.76Â° with respect to the horizontal. It then dropsdown to a horizontal surface and bounces elastically back up asshown.

The picture is to scale. It shows the position of the mass atequal time intervals starting from rest at V. The height of themass at P is the same as at U.

Answer Choices: G-Greater than, L-Less Than, E-Equal to

(a) The speed change between V and X is ____ between X andT.

(b) The velocity of m at U is ____ that at P.

(d) The speed of m at S is _____ that at Q.

(e) The size of the total force on m at Q is _____ at X.

(f) The mechanical energy of m at P is _____ that at Q.

PCS 211 Study Guide - Final Guide: Electric Potential, Electric Field, Equipotential

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