Questions
Two concentric spheres of radii R and r have similar charges with equal surface densities (). The electric potential at their common centre will be
detailed solution
Correct option is C
Let Q and g be the charges on the spheres. The potential at their common centre is given byV=14πε0⋅QR+14πε0⋅qr=1ε0Q4πR2×R+q4πr2×r=1ε0[σR+σr]=σε0(R+r)∵σ=Q4πR2=q4πr2Talk to our academic expert!
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Four equal charges Q are placed at the four comers of a square of each side is 'a'. Work done in removing a charge -Q from its centre to infinity is
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