Make \( Q_{2} \) the subject of the formular \( F=k \frac{Q_{1} Q_{2}}{r^{2}} \)

To make \( Q_{2} \) the subject of the formula \( F = k \frac{Q_{1} Q_{2}}{r^{2}} \), you'll want to isolate \( Q_{2} \). Start by multiplying both sides by \( r^{2} \): \[ F r^{2} = k Q_{1} Q_{2} \] Next, divide both sides by \( k Q_{1} \): \[ Q_{2} = \frac{F r^{2}}{k Q_{1}} \] And there you have it! \( Q_{2} \) is now isolated.