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The elecric field intensity at distances r and 2r from a long uniformly charged straight wire are E1 or E2 respecrively. The ratio of E1 and E2 will be ?

A)1/2 B)2/1. C)1/1. D)none of these

Electric field intensity is inversely proportional to square of the distance.

Thus,

$\frac{{E}_{1}}{{E}_{2}}=\frac{{{r}_{2}}^{2}}{{{r}_{1}}^{2}}=\frac{{2}^{2}}{{1}^{2}}=\frac{4}{1}$

Regards

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