Introduction to Electrodynamics
4th Edition
ISBN: 9781108420419
Author: David J. Griffiths
Publisher: Cambridge University Press
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Chapter 2.5, Problem 2.40P
(a)
To determine
Whether, the force on charge q is necessarily zero.
(b)
To determine
Whether, the force between a point charge and a nearby uncharged conductor is always attractive.
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Two identical He-filled spherical bal-
loons each carrying a charge q are tied to a weight W with
strings and float in equilibrium as shown in Fig. 1.12(a).
Find:
1. the magnitude of q, assuming that the charge on each
balloon acts as if it were concentrated at the centre.
2. the volume of each balloon.
9, m
(8)
W
q, m
Fig.
mg
T cose
T sine
(b)
Problem 2: Four metal balls, A, B, C and D of equal mass carry non-zero charges QA,
QB, Qc and Qp, respectively, where
QA > 0.
When suspended in different combinations from rigid horizontal supports by insulating
threads of equal lengths, the balls are deflected from the vertical by the electric forces they
exert on each other, as shown in the three figures below.
Fig. 2.41
Which of the following could be true?
Ов |QB\,
(C) Qc = -QA 0
Qp >0
Ов > Qc > 0, Qp 0
QD 0,
Two identical He-filled spherical bal.
loons each carrying a charge q are tied to a weight Wwith
strings and float in equilibrium as shown in Fig. 1.12(a).
Find:
1. the magnitude of q, assuming that the charge on each
balloon acts as if it were concentrated at the centre.
2. the volume of each balloon.
9, m
(8)
q, m
Fig.
mg
T cose
T sine
(b)
Chapter 2 Solutions
Introduction to Electrodynamics
Ch. 2.1 - (a) Twelve equal charges,q, arc situated at the...Ch. 2.1 - Find the electric field (magnitude and direction)...Ch. 2.1 - Find the electric field a distance z above one end...Ch. 2.1 - Prob. 2.4PCh. 2.1 - Prob. 2.5PCh. 2.1 - Find the electric field a distance z above the...Ch. 2.1 - Find the electric field a distance z from the...Ch. 2.2 - Use your result in Prob. 2.7 to find the field...Ch. 2.2 - Prob. 2.9PCh. 2.2 - Prob. 2.10P
Ch. 2.2 - Use Gauss’s law to find the electric field inside...Ch. 2.2 - Prob. 2.12PCh. 2.2 - Prob. 2.13PCh. 2.2 - Prob. 2.14PCh. 2.2 - A thick spherical shell carries charge density...Ch. 2.2 - A long coaxial cable (Fig. 2.26) carries a uniform...Ch. 2.2 - Prob. 2.17PCh. 2.2 - Prob. 2.18PCh. 2.2 - Prob. 2.19PCh. 2.3 - One of these is an impossible electrostatic field....Ch. 2.3 - Prob. 2.21PCh. 2.3 - Find the potential a distance s from an infinitely...Ch. 2.3 - Prob. 2.23PCh. 2.3 - Prob. 2.24PCh. 2.3 - Prob. 2.25PCh. 2.3 - Prob. 2.26PCh. 2.3 - Prob. 2.27PCh. 2.3 - Prob. 2.28PCh. 2.3 - Prob. 2.29PCh. 2.3 - Prob. 2.30PCh. 2.4 - Prob. 2.31PCh. 2.4 - Prob. 2.32PCh. 2.4 - Prob. 2.33PCh. 2.4 - Find the energy stored in a uniformly charged...Ch. 2.4 - Prob. 2.35PCh. 2.4 - Prob. 2.36PCh. 2.4 - Prob. 2.37PCh. 2.5 - A metal sphere of radius R, carrying charge q, is...Ch. 2.5 - Prob. 2.39PCh. 2.5 - Prob. 2.40PCh. 2.5 - Prob. 2.41PCh. 2.5 - Prob. 2.42PCh. 2.5 - Prob. 2.43PCh. 2.5 - Prob. 2.44PCh. 2.5 - Prob. 2.45PCh. 2.5 - If the electric field in some region is given (in...Ch. 2.5 - Prob. 2.47PCh. 2.5 - Prob. 2.48PCh. 2.5 - Prob. 2.49PCh. 2.5 - Prob. 2.50PCh. 2.5 - Prob. 2.51PCh. 2.5 - Prob. 2.52PCh. 2.5 - Prob. 2.53PCh. 2.5 - Prob. 2.54PCh. 2.5 - Prob. 2.55PCh. 2.5 - Prob. 2.56PCh. 2.5 - Prob. 2.57PCh. 2.5 - Prob. 2.58PCh. 2.5 - Prob. 2.59PCh. 2.5 - Prob. 2.60PCh. 2.5 - Prob. 2.61P
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