Question

three metallic spheres say a,b and c have charges 12c,-12cand and 12colombrespectively respectively. a,b and c are brought in contact such that charges on each of A and B becomes 4. what is charge on c

Answer 1

total charge in the system are conserved
ATQ....A-12C. B-12. C-12
total charge is 36C.
then after contact A-4. B-4.
then 36-8= 28C...
therefore C have 28C charge...