Two concentric spheres kept in air have radii R and r. They have similar charge and equal surface charge density σ. The electric potential at their common centre is ( 
permittivity of free space)
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
As both the spheres have equal surface charge density σ, therefore charges on the spheres are
and 
Electric potential at their common center O is
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