## anonymous one year ago Two objects, each with a charge of +5.0 × 10^-5 C, are separated by 0.50 m. What is the magnitude and type of force between them? A. -90 N, attractive B. -45 N, repulsive C. +45 N, attractive D. +90 N, repulsive

1. Michele_Laino

2. anonymous

ok!

3. Michele_Laino

the force is repulsive, since both charges are positive

4. anonymous

ok! so it is either B or D? how can we find out which one?

5. Michele_Laino

the magnitude of that force, is given by the Coulomb's law: $\large F = K\frac{{{Q_1}{Q_2}}}{{{d^2}}} = 9 \times {10^9}\frac{{5 \times {{10}^{ - 5}} \times 5 \times {{10}^{ - 5}}}}{{{{\left( {5 \times {{10}^{ - 1}}} \right)}^2}}}$

6. anonymous

ok! we get 90? so our solution is choice D?

7. Michele_Laino

that's right!

8. anonymous

yay!! thank you!!

9. Michele_Laino

:)