Question

two concentric conducting spheres of radii R and 2R are carrying charges Q and -2Q respectively.If the charge on inner sphere is doubled, the potential difference between the two spheres will
(2) Become four times
(1) Become two times
(4) Remain same
(3) Be halved
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Answer 1

Answer:

correct alternative is (1) becomes two times

Answer 2

Explanation:

vs1=k2q/r+k(-2q)/2r

vs1=kq/k

vs2=k(2q)/2r+k(-2q)/2k = 0

v=kq/r