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Electrostatic force experienced by - 3 m...

Electrostatic force experienced by `- 3 mu C` charge placed at point 'P' due to a system 'S' of fixed point charges as shown in figure is `vec(F) = (21 hat(i) + 9hat(j))mu N`.

Find out electric field intensity at point P due to S.

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`vec(F) = qvec(E)`
`rArr (21 hat(i) + 9hat(j))mu N = -3 mu C(vec(E))`
`rArr vec(E) = -7hat(i) - 3hat(j) (mu N)/(C )`
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