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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