Resistance between spherical conductors

Discussion in 'Electronic Basics' started by [email protected], Mar 26, 2007.

1. Guest

Hi! I have a problem and I have no clue how to do it...

The space between two concentric spherical-shell conductors is filled
with a material that has a resistivity of 10^9 ohm meter. If the
inner shell has a radius of 1.5 cm and the outer shell has a radius of
5 cm, what is the resistance between the conductors?

I found a hint that says to find the resistance of a spherical shell
element of the material of area 4(pi)r^2 and length dr, and integrate
to find the total resistance of the set of shells in series.

Any help would be great! thanks

2. LionelGuest

You really shouldn't be asking homework questions on Usenet. Have you

3. Phil AllisonGuest

** Try " alt.math ".

Yours is a math problem, not basic electronics.

........ Phil

4. Homer J SimpsonGuest

You don't know how to integrate such a function?

5. Dan CobyGuest

Please let him do his own homework. Otherwise he will not learn.

6. John LarkinGuest

That's correct. Treat each shell as a flat sheet of area equal to the
surface of the shell. That's a good approximation for a thin shell.

John

7. John LarkinGuest

I didn't do the integration for him. A little visualization sometimes
helps, and I pretty much rephrased what he already knew.

John