ElectrostaticsHard
Question
Two concentric conducting thin spherical shells A and B having radii rA and rB (rB > rA) are charged to QA and - QB (|QB|>|QA|). The electrical field along a line, (passing through the centre) is :
Options
A.
B.
C.
D.
Solution
Electric field inside sphere A is zero. Potential inside is uniform. If we move out of the sphere starting from centre, we find potential dropping to -ve value at the surface of B. After that it becomes zero at infinity as we take potential at infinity to be zero.
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