Magnetostatic Problems

1. Sep 15, 2004

kelvintc

1) Calculate the self-inductance of a coaxial cable of inner radius a and outer radius b. The inner conductor is made of an inhomogenous material having u = 2u0/(1+r)
Answer : u0L/8pie + u0L/pie (ln(b/a) - ln((1+b)/(1+a)))

2) Two #10 copper wires(2.588 mm in diameter) are placed parallel in air with a seperation distance d between them. If the inductance of each wire is 1.2uH/m, calculate
(a) L(in) and L(ext) per meter for each wire
(b) The seperation d
Answer : (a)0.05, 1.15 uH/m, (b) 40.79cm

3) A conductor of radius a is bent into a circular loop of mean radius r. If r = 10cm and 2a = 1cm, calculate the internal inductance of the loop.

Really can't the number 1 answer. I get a^3 in my answer. Number 2 no idea since L = L(in) + L(ext). As well as number 3.

Thank you.

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Last edited: Sep 16, 2004
2. Sep 16, 2004

kelvintc

cannot use Latex code anymore?

3. Sep 16, 2004

Tide

Apparently they changed servers and LaTeX broke but they're working on fixing it.

4. Sep 16, 2004

kelvintc

anyone can help me on these magnetostatic problems? i'm stucked ..