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Electric field affecting a charged particle question

by crispy_nine
Tags: affecting, charged, electric, field, particle
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Feb23-08, 10:53 AM
P: 6
At the moment I'm trying to figure out charged particle in electric field behavior and there's a type of question that seems to be confusing me lots.
Ok, here's such a question that i'm not sure about:

A virus rests on the bottom plate of oppositely charged parallel plates in the
vacuum chamber of an electron microscope. The electric field strength between
the plates is 2.00 105 N/C, and the bottom plate is negative. If the virus has a
mass of 1.00 1015 kg and suddenly acquires a charge of 1.60 1019 C, what
are its velocity and position 75.0 ms later? Do not disregard gravity.
Answer: ( y = 6.24 cm )

I was trying to apply conservation of energy but I'm not sure how to involve the time aspect. I'd appreciate any insight. Thanks
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Doc Al
Feb23-08, 11:03 AM
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P: 41,543
To find the time, start by finding the acceleration.

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