First slide

Electric dipole

Question

A given charge situated at a certain distance from a short electric dipole on its axis and experiences a force F. If the distance of the charge from the dipole is doubled the force acting on the charge will be

Moderate

A

2F
B

F/2
C

F/4
D

F/8

Solution

$F \propto \frac{1}{r^{3}} \Rightarrow \frac{F^{1}}{F} = {(\frac{r}{2 r})}^{3} \Rightarrow F^{1} = F / 8$

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