Two-point charges of 1 nC and 2 nC are placed at the two corners of equilateral triangle of side 3 c

Question

Two-point charges of 1 nC and 2 nC are placed at the two corners of equilateral triangle of side 3 cm . The work done in bringing a charge of 3 nC from infinity to the third corner of the triangle is

$\_\_\_\_$ $\mu J$.

$$\frac{1}{4\pi\epsilon_{0}} = 9 \times 10^{9}\text{ }N.m^{2}/C^{2}$$

Accepted Answer

$${\left( q_{2} ight) }{W = \left( \frac{{kq}_{1}}{\mathcal{l}} + \frac{{kq}_{2}}{\mathcal{l}} ight)q_{3} }{= \frac{9 	imes 10^{9}}{3 	imes 10^{- 2}}\left( 3 	imes 10^{- 9} ight) 	imes 3 	imes 10^{- 9} }{= 27 	imes 10^{- 7}	ext{ }J = 2.7\mu	ext{ }J}$$

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