College Physics
OER 2016 Edition
ISBN: 9781947172173
Author: OpenStax
Publisher: OpenStax College
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Textbook Question
Chapter 24, Problem 3CQ
Why is the direction of the current shown in each part of Figure 24.6 opposite to the electric field produced by the wire’s charge separation?
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4. A circular capacitor of radius R holds a conductive current I. as it begins
charging. As the current charges the capacitor, the electric field between the
plates begin to increase in strength of E(t) = at³ +c in Newtons per Coulomb.
(a) State the expression for Maxwell-Ampere's law. What is the major dif-
ference between the Maxwell-Ampere law and Ampere's Law? Show how
we arrive to this solution.
(b) Determine the magnetic field strength at t = 2 seconds and position from
center of cross section of capacitor at r = (1/4)R in terms of µo and eo.
*** 27. Two circular discs form the plates of a capacitor that is placed in a circuit in which
a current I = 3 amps is going to the right. Each plate has an area of 10-2 m2. The distance
between the plates is 1 cm.
Sy bno 0E dignsilollon
a) At a time when the charge on the plates is 6 C, find the electric field in the region
between the plates.
b) If a positive current is flowing, the charge on the capacitor will be increasing. Use
the appropriate right-hand rule to find the direction of the magnetic field in the region
between the plates of the capacitor.
C) Find the magnitude of the magnetic field between the two plates at a distance r = 3 cm
from the centerline of the circular plates, as shown. [Hint: You may assume that the
magnetic field is constant along the dashed circular path of radius r shown in the figure
and that it is everywhere tangent to the circle.]
1. The force on a wire carrying 8.75 A is a maximum of 1.28 N when
placed between the pole faces of a magnet. If the pole faces are 5.4
cm in diameter, what is the approximate strength of the magnetic
field?
2. A 60 W fluorescent bulb hasa resistance of about 12 Q when cold
(30C) and 120 Q when on (hot). Estimate the temperature of the
filament when hot assuming an average temperature coefficient of
resistivity
a = 0.0080(C°)¹.
Chapter 24 Solutions
College Physics
Ch. 24 - The direction of the electric field shown in each...Ch. 24 - Is the direction of the magnetic field shown in...Ch. 24 - Why is the direction of the current shown in each...Ch. 24 - Prob. 4CQCh. 24 - Prob. 5CQCh. 24 - Should the straight wire antenna of a radio he...Ch. 24 - Under what conditions might wires in a DC circuit...Ch. 24 - Give an example of interference of electromagnetic...Ch. 24 - Prob. 9CQCh. 24 - Can an antenna be any length? Explain your answer.
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