Capacitance between two wires

[Michael777]

I have two wires of lengths 30cm and 15cm placed 2cm away from each other, with the first wire having a potential of 12v and the other 24v. For wires of equal lengths the capacitance can be calculated by the expression C=[pi*e0*l/cosh^-1(d/a)]. l-the length,d- the distance between the wires and a- the radius.How can I calculate the capacitance between the two wires given their potentials and different lengths? Any suggestions will be really helpful

 

[Miguel Lopez]

If you need to calculate the true value of capacitance, I have no idea.

But if you need to know if the capacitance would be high, I can tell you the in the college we used a mnemonic in which a pair of twisted wires would have about 2pF/cm. So, in your case, I think the capacitance will be very, very low.

 

[Arouse1973]

Here is an example I have done for a 4 m pair of wires 45 mm apart with a radius of 1.5 mm. Hope this helps
Adam