Please give accurate and correct final answers to all the parts of this question

Question

Please give accurate and correct final answers to all the parts of this question with the right significant figure

The cross section of a long coaxial cable is shown in the figure, with radii as given. The linear charge density on the inner conductor is-40 nC/m and the linear charge density on the outer conductor is -80 ncim. The i ner and outer cylindrical surfaces are respectively denoted by A B C, and D, as shown = 8.85 x 10 2 C2/N m2 The radial component of the electric field at a point that 45 mm from the axis is closest to 49 mm 51 mm -3.2 104 N/C. 0 -1.6*104 N/C. +1.6 104 N/C. 0 +3.2x104 NC. zero

Explanation / Answer

Correct Ans:

-1.6 x 10^4 N/C

explanation:

Using Gauss's law

int E.dA = Q/e0

E = lambda(inner)/2 pi e0 r

E = 2 k lambda(inner)/r

E = 2 x 9 x 10^9 x -40 x 10^-9/(45 x 10^-3) = -1.6 x 10^4 N/C

Hence, E = -1.6 x 10^4 N/C

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