Two spherical shells have a common center. The inner shell has radius R1 = 5.00

Question

Two spherical shells have a common center. The inner shell has radius R1 = 5.00 cm and charge q1 = +5.00×10?6 C ; the outer shell has radius R2 = 15.0 cm and charge q2 = ?7.00×10?6 C . Both charges are spread uniformly over the shell surface. Take V = 0 at a large distance from the shells.

a)What is the electric potential due to the two shells at the distance r = 2.50 m from their common center?

b)What is the electric potential due to the two shells at the distance r = 10.0 cm from their common center?

c)What is the electric potential due to the two shells at the distance r = 10.0 cm from their common center?

Explanation / Answer

A. V= k (q1/r1+q2/r2)= 9*10^9*10^-6( 5/.05-7/0.15)= 480000 V

B. V= 9*10^9*10^-6(5/.1-7/.15)= 30000 V

C. Same as (b)

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