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hi, thanks for helping me.

heres the question

Suppose the moon had a net negative charge equal to -q and Earth had a net positive charge equal to +10q. What value of q would yield the same magnitude force that you now attribute to gravity?

(answer in coulombs) I have it on a thing called webassign, and you can only have 15 tries...... i used 14. here are my wrong attempts:

1.6e-19

1.6e-18

-1.6e-18

-1.6e-20

1.6e-20

1.6e18

8.99e10

-8.99e10

.1

-.1

8.99e9

-8.99e9

-8.99e8

-10