Substituting values in the formula


Okay on your next step what you do is just to substitute. We already know the electric net is equals to 5.44 by 10 to the power 6 it's given so by just substituting this value on the formula you score a mark and by the way you already scored a mark by just writing down the correct formula so this is equals 2, k it's a constant it's always 9 by 10 to the power 9. 

It's always given to you as part of the formula sheet and then you're calculating the charge so this is the charge of x so the reason why I made it charge of x it's so that we bare in mind that when we substitute the distance is the distance from charge x to this point so that's why I've got 5 by 10 to the power -3. 

It's by 10 to the power -3 because we had to convert it to meters so it's actually the distance from there up to there so it's 2 plus 3 that's why it's 5 by 10 to the 3 to convert it and don't forget to square so it's plus into 9 by 10 to the power -9 and Q so that means we'll use the distance from charge y to that point so it's given as 3 and it's 3 by 10 to the power minus 3 convert it to meters and also remember to square.


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