Two conducting spheres of radii R1 and R2 are charged with charges Q1 and Q1 respectively. On bringing them in contact there is:-
A.no charge in the energy of the system
B.an increase in the energy of the system if Q1R2≠Q2R1
C.always a decrease in energy of the system
D.a decrease in energy of the system if Q1R2≠Q2R1

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