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Electrostatic force experienced by -3 mu...

Electrostatic force experienced by `-3 muC` 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)) muN`.
(i) Find out electric field intensity at point P due to S.
(ii) If now, `2 muC` charge is placed and `-3 muC` is removed at point P then force experienced by it will be.

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