Posted by sammeh on Thursday, December 3, 2009 at 2:07am.
0.1 micrometer is 1 x 10^-7 m
ke/r^2 = 8.99*10^9 * 1.60*10^-19/10^-14 = 143,840 N/C. The direction is towards the electron (East)
The answer you wrote is correct to three significant figures, but you converted 0.1 micrometer incorrectly
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