Let a total charge 2 Q be distributed in a sphere of radius R, with the charge density given by , where r is the distance from the centre. Two charge A and B, of -Q each, are placed on diametrically opposite points, at equal distance, a, from the centre. If A and B do not experience any force, then:
by Gauss law
force
From (1) and (2)
also
from (3) and (4)
Option 1)
Option 2)
Option 3)
Option 4)
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