Electrostatics 7 Question 16
16. Which one of the following statement is correct? (2016 Adv.)
(a) The balls will execute simple harmonic motion between the two plates.
(b) The balls will bounce back to the bottom plate carrying the same charge they went up with.
(c) The balls will stick to the top plate and remain there.
(d) The balls will bounce back to the bottom plate carrying the opposite charge they went up with.
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Answer:
Correct Answer: 16. (d)
Solution:
- Balls will gain positive charge and hence move towards negative plate.
On reaching negative plate, balls will attain negative charge and come back to positive plate.
So on, balls will keep oscillating.
But oscillation is not S.H.M.,
As fore on balls is not $\propto x$.
$\Rightarrow(\mathrm{d})$ is correct.
