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Q.

Two conducting spheres each of radius R carry charge q. They are placed at a distance r from each other, where r > > 2R. The neutral point lies at a distance r/2 from  either sphere. If the electric field at the neutral point due to either sphere be E, then the total electric potential at that point will be

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a

r E/2

b

r E

c

R E

d

RE/2

answer is B.

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Detailed Solution

E=14πε0×q(r/2)2
and V=14πε0×q(r/2)
 r=VE  or  V=rE

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