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Old Apr 30th 2016, 05:23 PM   #1
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Electric field strength

I am having some trouble calculating the electric field strength for the following question:

A positive ion has a charge-to-mass ratio of 2.40 10^7 C/kg. It is held stationary in a vertical electric field.
What is the strength and direction of the electric field?

I know the charge-to-mass ratio is used somehow to help determine the field strength but i'm unsure how to do it. For example, if you want to calculate the charge from Q/m what mass value do you use, and if you want the mass what charge value do you use? I also think the direction of the field in upwards as it's a positive ion.

Any help or tips would be much appreciated.

Shown on the link is the actual question. The answer is A but I don't know how to get the electric field strength.

http://i.imgur.com/UJc2XoO.png

Last edited by Clyner82; May 1st 2016 at 08:39 AM. Reason: Adding extra information
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