Question

Two charged conducting sphere are brought into contact with each other for a long time and then separated. Given that both sphere are identical and equally but oppositely charged. Which of the following statement is true ?

• A. The charge on each sphere is the same as it was before the sphere were brought into contact
• B. The sphere will be equally charged and positive
• C. The sphere will be equally charged and negative
• D. Both sphere will become neutral
  
• E. The positive sphere must have more charge than the negative sphere

Answer 1

The correct option is D Both sphere will become neutral

The spheres when in contact would tend to have equal potential. Since they have same dimensions, they should necessary have same amount of charge.

From conservation of charge,

Initial amount of charge=Final amount of charge

$⟹q+(-q)=Q+Q$

$⟹Q=0$

Hence both spheres become neutral.