# Voltmeter cylindrical shell help

## Homework Statement

A very long insulating cylindrical shell of radius 6.00 cm carries charge of linear density 8.90*10^-6 C/m spread uniformly over its outer surface.
*What would a voltmeter read if it were connected between the surface of the cylinder and a point 4.70 above the surface. and What would a voltmeter read if it were connected between the surface and a point 1.00 from the central axis of the cylinder?

## Homework Equations

delta V= ( lemda/ 2pi epslion) (ln(rb/ra))

## The Attempt at a Solution

delta V= ( lemda/ 2pi epslion) (ln(rb/ra))

## The Attempt at a Solution

Related Introductory Physics Homework Help News on Phys.org

if you dont show your attempt to solve the question ,no one would be able to help , please show your work even if it is wrong..

## Homework Statement

A very long insulating cylindrical shell of radius 6.00 cm carries charge of linear density 8.90*10^-6 C/m spread uniformly over its outer surface.
*What would a voltmeter read if it were connected between the surface of the cylinder and a point 4.70 above the surface. and What would a voltmeter read if it were connected between the surface and a point 1.00 from the central axis of the cylinder?

## Homework Equations

delta V= ( lemda/ 2pi epslion) (ln(rb/ra))

## The Attempt at a Solution

delta V= ( lemda/ 2pi epslion) (ln(rb/ra))
what i did was
(8.90* 10^-6/ 2 pi 8.85*10^-12)ln (4.5/6)
i got -39084.73

I think that the equation you used is applied for charged conducting cylinder, and your question involves cylindrical shell.. so are they the same?

I suggest you try to think if you can somehow relate the question you have to a ring of charge in order to find the voltage..

Redbelly98
Staff Emeritus
Homework Helper

No, this forum does not work that way.

## The Attempt at a Solution

delta V= ( lemda/ 2pi epslion) (ln(rb/ra))
what i did was
(8.90* 10^-6/ 2 pi 8.85*10^-12)ln (4.5/6)
i got -39084.73