The distance between the dipole and the point charge in the diagram in the (^figure is...

Question

Question

The distance between the dipole and the point char

Answer 1

Answer #1

field of a dipole varies as 1/d³ on the dipole axis. whn d increase to 10d force reduces by 10³ =1000.

Force between q and +Q , $\propto \frac{1}{(d+s/2)^{2}}$

Force between -q and +Q is, $\propto \frac{1}{(d-s/2)^{2}}$

netforce is the difference, $\propto \frac{ds}{(d^{2}-s^{2}/4)^{2}}$

$\propto \frac{d}{(d^{2})^{2}}$ d>>s

$\propto \frac{1}{d^{3}}$

Answer 2

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