# Help with Conductance

1. Sep 28, 2004

### Christopher

I have this question whihc is confusing me on Conductance. The Question is Paper uniformly coated with graphite can be electrically conducting. A strip of the coated paper is 10mm wide and 250mm long has a resistance of 2KO (ohms). Sggest dimensions for a strip with conductance 1mA V-1 (little -1 above V, sorry can't remember the name for that )

Okay this is what I know already which could help me. Conductance is increased with the length of wire (strip) and decreased with the width.

2. Sep 28, 2004

### Tide

I think you're looking for this:
$$\frac {G_1}{G_2} = \frac {L_2}{L_1} \frac {W_1}{W_2}$$
You have the relationships backward. Conductance will decrease with increasing length and increase with increasing length, assuming constant temperature.

3. Sep 28, 2004

### Christopher

Thankyou. I was thinking of Resistance then which is the other way round.