Scientific notations


So your next step it should be a quick one so it's more like you are adding this term plus that term so you just punch all of this on a calculator plus all of this on a calculator and this is the value that you get. So remember because you're calculating a charge then you divide by that number so that it cancels out and the answer that you get it should be the magnitude of your charge and remember is the magnitude of charge x which is the same as the magnitude of charge y. 

Your last step you've got your division there you've just divided the answer by 1.36 by 10 to the power 15 so that it cancels out and you remain with q which is equals to this divided by that and the answer that you get when you punch on a calculator is this so this is the answer in coulombs. It's not in a scientific form so normally what I'll do is to count from the comma there and say I've got one two three four five six seven eight nine. 

So I just stop at that number which is 4 by 10 to the power I counted 9 times so that's why you have minus 9 coulomb so that's how you get to your final answer which is 4 by 10 to the power -9 with some calculations. Your calculator may give you the final answer in a form of scientific form but in this case it was in a decimal form so we had to convert it to a scientific notation so this is how you write that number in scientific notation so that's how you simply solve for question 8.4.

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