Question

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

Answer 1

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

Answer 2

ok! so we plug in ?

Answer 3

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

Answer 4

ok! so we get this?

3E-5?

Answer 5

that's right!

Answer 6

so that would be choice B? :/

Answer 7

yes! since the force is attractive

Answer 8

yay!! thanks!!:D

Answer 9

:)