Question

In an experiment to demonstrate Coulomb's law in electrostatics, the force F between two small charged spheres is measured for various distances r between their centres. A graph is plotted of log F (y-axis) against log r(x-axis). The slope of this graph is-

• A. –2
• B.
  • ½
• C. –1/2
• D.
  • 2

Answer 1

Answer: (A)

–2

Answer 2

F = $\frac { K q _ { 1 } q _ { 2 } } { r ^ { 2 } }$

log F = log (Kq₁ q₂) – 2 log r

or y = c + mx \ m = – 2