Physics Technology Update (4th Edition)

Published by Pearson
ISBN 10: 0-32190-308-0
ISBN 13: 978-0-32190-308-2

Chapter 20 - Electric Potential and Electric Potential Energy - Problems and Conceptual Exercises - Page 717: 12

Answer

a) 0 V b) -48 V c) 60 V d) No

Work Step by Step

(a) We know that $\Delta V=E(\Delta x)$ We plug in the known values to obtain: $\Delta V=(1200N/C)(0.0m)=0V$ (b) As $\Delta V=-E(\Delta x)$ We plug in the known values to obtain: $\Delta V=-(1200N/C)(0.04m)=-48V$ (c) We know that $\Delta V=E(\Delta x)$ We plug in the known values to obtain: $\Delta V=(1200N/C)(0.05m)=60V$ (d) We can see from the above results that we only have a potential difference at any two points and it is not possible to find the potential ($V_A$) at point A (it can be determined only when we are given either $V_B$ or $V_C$).
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