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This is a homework question, but Im trying to see if Ive got the format correct. Two protons are separated by 3.80 x 10-10m. Find the electric force exerted by one proton on the other

........................... |q1||q2|

So Ive got Fe =.. ke ------------

............................... r^2

Im told the proton charge is +1.6021917 x 10-19

so................... 2.5667E-38

............ke * .. -------------

...................... 1.444 E-19

then...... ke * 1.7775 E -19

then 1.5979 E-9 as the final answer?

Is there some way to write equations and allow whitespace?