(Analytical interpretation of distance dependence) The product of two point charges…
PHYSICS · Multi-part · CBSE · Physics · Electric Charges and Fields · Electric Charges and Fields
Problem
(Analytical interpretation of distance dependence)
The product of two point charges is kept constant at a value Q0, while their separation r is varied in air.
(i) Show that the electrostatic force F between the charges can be expressed in the form F=Kr−2, where K is a constant for the given pair of charges.
(ii) By taking common (base-10) logarithms of the relation in part (i), obtain the equation of a straight line for a plot of logF versus logr. Write explicit expressions for the slope and the intercept.
(iii) An experiment gives a slope of −1.95 for the logF versus logr plot. Discuss two possible experimental factors that could account for the deviation of this slope from the ideal theoretical value.