Use method of images: Replace sphere by image charge (q' = -\fracRd q) at distance (b = \fracR^2d) from center on line joining center to (q). Force on (q) due to induced charges = force due to (q'): [ F = \frac14\pi\epsilon_0 \fracq q'(d - b)^2 = \frac14\pi\epsilon_0 \fracq\left(-\fracRd q\right)\left(d - \fracR^2d\right)^2 ] Simplify: [ F = -\frac14\pi\epsilon_0 \fracq^2 R d(d^2 - R^2)^2 ] Negative ⇒ attractive.
Students often say, "No, because the helicopter is not touching the platform." Or, "Yes, due to gravity." physics galaxy discussion questions solutions
: The latest five-volume edition of the Physics Galaxy series includes complete solutions to all questions, making it suitable for self-study. Use method of images: Replace sphere by image
$\theta_E = 2'' \Rightarrow M \approx 4 \times 10^11 M_\odot$ (within Einstein radius). $\theta_E = 2'' \Rightarrow M \approx 4 \times
Q: What is the best way to approach Physics Galaxy discussion questions? A: Start by reading the chapter and understanding the concepts, then attempt to answer the questions on your own before referring to the solutions.