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Homework Statement
GIVEN:
a=radius of inner electrode = 0.05 cm
b=radius of outer electrode = 0.5 cm
Vo = 130 V
QUESTION: What is the electric field at surface of the inner electrode in units of V/m?
Homework Equations
Given equations
Potential at radius r b/w inner&outer electrodes is
V=Vo*ln(r/a) (Eq 1)
Elect field at r is
E(V/m) = (1/r)*[V/ln(b/a)] Eq (2)
The Attempt at a Solution
First in finding the V at surface of inner electrode,
the value of r is same as a because it's at surface, so the ln (r/a) term
becomes zero. So that is where I am stuck. Are the equations I am given correct?