H2P-408

Charges in a uniform electric field

H2 Physics · JC 2 · Hard · Charges in a uniform electric field

A uniform electric field exists between two horizontal plates. A small oil drop of charge

q

and mass

m

is suspended at rest between the plates. The field strength is then increased by a factor of 1.5. What is the subsequent vertical acceleration of the drop?

Upwards with acceleration $0.5g$
Downwards with acceleration $0.5g$
Upwards with acceleration $1.5g$
It remains at rest

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