A conducting spherical shell is earthed. A positive charge \( +q_{1} \) is placed at the center ...

A conducting spherical shell is earthed. A positive charge \( +q_{1} \) is placed at the center and another small positive charge \( +q_{2} \) is placed at a distance \( r \) from \( q_{1} \) (see figure). Ignore the effect of induced charge due to \( q_{2} \) on the sphere. Then the coulomb force on \( q_{2} \) is (1) zero (2) \( \frac{q_{1} q_{2}}{4 \pi \varepsilon_{0} r^{2}} \) (3) \( \frac{q_{1} q_{2}}{4 \pi \varepsilon_{0}(r-R)^{2}} \) (4) \( \frac{q_{1} q_{2}}{4 \pi \varepsilon_{0}\left(r^{2}-R^{2}\right)} \) 📲PW App Link - https://bit.ly/YTAI_PWAP 🌐PW Website - https://www.pw.live