A charged oil drop is between two parallel plates in a Millikan type experiment.

Question

A charged oil drop is between two parallel plates in a Millikan type experiment. The potential difference between the plates is adjusted so that the drop is stationary. If the oil drop coalesces (combines) with another uncharged oil drop, what will the combined drop do?

Move upwards.

Remain at rest.

Move downwards.

Move either upwards or downwards depending on the mass of the second drop.

Move upwards.

Remain at rest.

Move downwards.

Move either upwards or downwards depending on the mass of the second drop.

Explanation / Answer

Move downwards since mass after is large than mass before and charge after is less than charge before.

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