I dont need the problem solved, I need help understanding which formula to use.

Question

I dont need the problem solved, I need help understanding which formula to use. So if you could please run through the formulas to solve it without plugging in values. I have used Couloumb's Law and Gauss' Law to try and solve it but maybe im just using the wrong radius, so please state which radius will be used as r. Thank you very much.

For the configuration shown in the figure below, suppose that a = 5.20 cm, b-22.0 cm, and c= 29.0 cm. Furthermore, suppose that the electric field at a point 1, 19 × 10· 13.7 cm from the center is 3.31 × 1' outward N/C radially inward, while the electric field at a point 48.0 cm from the center is N/C radially Insulator Conductor From this information, find the following charges From this information, find the following charges. (Include the sign of the charges.)

Explanation / Answer

For part a,

electric field at 13.7 cm is given,

THis field is only due to the surface charge on insulator which will be kq/r2. Here only unknown is q and can be found by equating this to given value.

b) For this part, you must understand that due to induction, -q will appear on the inside surface of conductor and +q on the outside. Here q is obtained by same procedure as in part a.

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