Two isolated conducting spheres S 1 and S 2 of radius 2 3 R and 1 3 R have 12   μ C and - 3  …

Two isolated conducting spheres S1 and S2 of radius 23R and 13R have 12 μC and -3 μC charges, respectively, and are at a large distance from each other, They are now connected by a conducting wire. A long time after this is done the charges on S1 and S2 are respectively:
  1. 4.5 μC of both
  2. +4.5 μC and -4.5 μC
  3. 3 μC and 6 μC
  4. 6 μC and 3 μC

Solution

Total charge =12-3=9 μC

If final charges are q1 and q2

q1q2=R1R2=21

q1=6 μC

q2=3 μC

Asked in: JEE Main 2020 (03 Sep Shift 1)

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