Learning Materials
Features
Discover
Chapter 15: Q14Q (page 616)
Coulomb’s law says that electric field falls off like . How can for a uniformly charged disk depend on , or be independent of distance?
Electric field can be independent of distance but is inversely proportional to the area of the disk which has dimension .
Over 30 million students worldwide already upgrade their learning with Vaia!
All the tools & learning materials you need for study success - in one app.
Get started for free
Two rings of radius are apart and concentric with a common horizontal x axis. The ring on the left carries a uniformly distributed charge of , and the ring on the right carries a uniformly distributed charge of. (a) What are the magnitude and direction of the electric field on the x axis, halfway between the two rings? (b) If a charge of were placed midway between the rings, what would be the force exerted on this charge by the rings?
If the magnitude of the electric field in air exceeds roughly 3 × 106 N/C, the air brake down and a spark form. For a two-disk capacitor of radius 47 cm with a gap of 1 mm, what is the maximum charge (plus and minus) that can be placed on the disks without a spark forming (which would permit charge to flow from one disk to the other)?
By thinking about the physical situation, predict the magnitude of the electric field at the center of a uniformly charged ring of radius carrying a charge role="math" localid="1668494008173" . Then use the equation derived in the text to confirm this result.
A thin plastic spherical shell of radius 5 cmhas a uniformly distributed charge of -25nCon its outer surface. A concentric thin plastic spherical shell of radius 8 cmhas a uniformly distributed charge of+64nC on its outer surface. Find the magnitude and direction of the electric field at distances of, 3 cm, 7 cm and 10 cmfrom the center. See Figure 15.63.
A thin-walled hollow circular glass tube, open at both ends, has a radius R and length L. The axis of the tube lies along the x axis, with the left end at the origin (Figure 15.58). The outer sides are rubbed with silk and acquire a net positive charge Q distributed uniformly. Determine the electric field at a location on the x axis, a distance w from the origin. Carry out all steps, including checking your result. Explain each step. (You may have to refer to a table of integrals.)
What do you think about this solution?
We value your feedback to improve our textbook solutions.
Explanations 
Textbooks 
Exams 
GCSE 
IGCSE 
AS 
A Level 
International A Level 
University Admissions Tests 
Flashcards 
Vaia AI 
Notes 
Study Plans 
Study Sets 
Find a job 
Find a degree 
Student Deals 
Magazine 
Mobile App