Question

# Suppose two spherical bodies' A ' and 'B' of equal mass say 'm', are rubbed against each other. Due to friction a positive charge appears on A and an equal amount of negative charge appears on B (A->Positively Charged; B->Negatively Charged). If these bodies are then placed 'r' meters apart from each other in a vacuum (where no force other than their mutual attraction is present) then what can be said about their acceleration?

A
None of them will accelarate.
B
They will both accelerate with equal accelaration.
C
They will both accelarate with unequal accelaration.
D
The data is not enough to draw any conclusion.

Solution

## The correct option is C They will both accelarate with unequal accelaration.When we place the spheres in the vacuum (with no force other than their mutual attraction) then they will both feel an accelaration according to newton's second law of motion. Since the force is attractive they will accelarate towards each other. As the direction of acceleration is opposite for both the bodies we can conclude with certainity that the acceleration will be unequal irrespective of whether the magnitude is equal or not. So the right answer is C.PhysicsNCERTStandard XII

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