Two stationary magnets, P and Q, repel. P exerts a force of 0.60 N to the right on Q. A student draws this force as an arrow of length 3.0 cm. Using the same scale, how should the force exerted by Q on P be represented?
A 3.0 cm3.0\ \mathrm{cm}3.0 cm arrow on Q pointing left
A 1.5 cm1.5\ \mathrm{cm}1.5 cm arrow on P pointing right
A 6.0 cm6.0\ \mathrm{cm}6.0 cm arrow on Q pointing right
A 3.0 cm3.0\ \mathrm{cm}3.0 cm arrow on P pointing left