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**[SOLVED] Voltage Query**

## Homework Statement

An insulating spherical shell with inner radius 25.0 cm and outer radius 60.0 cm carries a charge of + 150.0 [tex]\mu C[/tex] uniformly distributed over its outer surface. Point

*a*is at the center of the shell, point

*b*is on the inner surface and point

*c*is on the outer surface

What will a voltmeter read if it is connected between

*c*and infinity?

## Homework Equations

[tex] V = \frac{1}{4\pi \epsilon _0}\frac{q}{r} [/tex]

## The Attempt at a Solution

In my text book,it says that any voltage between a point and infinity will equal 0, but entering 0 says it is wrong.

Using the above equation, how do you put the radius shou.d equal infinty

Any Ideas?

TFM