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I would like to have some guidance with this problem. i would like to know please, if I do good or bad.

**A coaxial line is made of two perfect conductors. The inner cylinder has radius a and the radius of the outer one is b. The outer conductor is grounded.**

Suppose that the inner conductor carries 1[C] of charge per meter of its length, that is its equivalent line charge density is ρlo=1[C/m].

a- Find the potential difference between the two conductors.

b- What is the potential of the outer conductor?

c- What is the potential of the inner conductor?

Suppose that the inner conductor carries 1[C] of charge per meter of its length, that is its equivalent line charge density is ρlo=1[C/m].

a- Find the potential difference between the two conductors.

b- What is the potential of the outer conductor?

c- What is the potential of the inner conductor?

a-

V= (Q/4*pi* ε0)( 1/a-1/b)

with Q=?

b-

Vb=0[V]

c-

Va=(Q/4*pi*ε0)(1/a)

I have some issue with the value of Q. since the length is not specified should Q be Q=1*L=L (Length)??