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Scenario three is right but One and two are wrong
You have four identical conducting spheres A, B, C
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scenario 1: A and B touch . The charge of A is distributed equally among A and B(since all spheres are identical).after being separated the charge of B will be (1/2)Q.

scenario 2: A and B touch . The charge of A is distributed equally among A and B(since all spheres are identical).after being separated the charge of B will be (1/2)Q. Then B and C touch . The charge of B is distributed equally among C and B. After being separated the charge of B will be (1/4)Q.

scenario 3:   A and D touch . The charge of A is distributed equally among A and D(since all spheres are identical).after being separated the charge of D will be (1/2)Q. Then D and C touch . The charge of D is distributed equally among C and D. After being separated the charge of D will be (1/4)Q. Again   A and D touch . The charge of D and A is distributed equally among A and D. after being separated the charge of A will be (3/8)Q. Then A and B touch . The charge of A is distributed equally among A and B. After being separated the charge of B will be (3/16)Q.  

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