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Q.

Figure shows a annular disc of outer radius R inner radius r, and uniform surface charge density. Total charge is q. The potential at the centre is kqr′k=14πε0 where r ' is

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a

R+r2

b

R−r2

c

R + r

d

R−r

answer is A.

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Detailed Solution

V=k∫x=rR σ−2πxdxx=k⋅σ2π(R−r)

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Figure shows a annular disc of outer radius R inner radius r, and uniform surface charge density. Total charge is q. The potential at the centre is kqr′k=14πε0 where r ' is