A charge of magnitude Q is placed at a distance \(\dfrac{R}{3}\) from the center of a spherical shell of radius R, uniformly charged to the charge density σ. The electrostatic force on Q is:
1. Proportional to σQ
2. Proportional to \(\dfrac{\sigma}{Q}\)
3. Proportional to \(\dfrac{Q}{\sigma}\)
4. Zero