Resistance between spherical conductors

Mar 26, 2007 6 Replies

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danielle_m_bradley 19 years ago

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

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Lionel 19 years ago

You really shouldn't be asking homework questions on Usenet. Have you tried asking your official instructor?

W "Some people are alive only because it is illegal to kill them." . | ,. w , \\|/ \\|/ Perna condita delenda est ---^----^---------------------------------------------------------------

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Phil Allison 19 years ago

** Try " alt.math ".

Yours is a math problem, not basic electronics.

....... Phil

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Homer J Simpson 19 years ago

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

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Dan Coby 19 years ago

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

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John Larkin 19 years ago

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

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John Larkin 19 years ago

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

John

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