## anonymous one year ago An object with a charge of +6.0 μC is 0.30 m from a second object and experiences an attractive force of 1.80 N. What is the magnitude of the charge on the second object? A. -6.0 μC B. -3.0 μC C. +3.0 μC D. +6.0 μC

1. Michele_Laino

here we have to apply the Coulomb law, so we get: $\large {Q_2} = \frac{{F{d^2}}}{{K{Q_1}}}$

2. anonymous

ok! so we plug in ?

3. Michele_Laino

$\large {Q_2} = \frac{{F{d^2}}}{{K{Q_1}}} = \frac{{18 \times {{0.3}^2}}}{{9 \times {{10}^9} \times 6 \times {{10}^{ - 6}}}}$

4. anonymous

ok! so we get this? 3E-5?

5. Michele_Laino

that's right!

6. anonymous

so that would be choice B? :/

7. Michele_Laino

yes! since the force is attractive

8. anonymous

yay!! thanks!!:D

9. Michele_Laino

:)