Four point charges $$Q1$$, $$Q2$$ , $$Q3$$ and $$Q4$$ are placed at the four corners A, B, C and D of a rectangle having sides $$40$$ cm and $$30$$ cm as shown in figure. Potential at the centre O is found to be $$20$$ volt. If the charge $$Q4$$ at corner D is removed, potential at O is found to be $$2$$ volt. Then the value of $$Q4$$ is

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Infinity Learn · Accepted Answer

Length  $$AC=BD=302+402$$  $$cm=50$$  cm.Now,  ∴$$KQ1AO+KQ2BO+KQ3CO+KQ4DO=Vand$$  $$KQ1AO+KQ2BO+KQ3CO=V$$|Subtracting,  V−V|$$=KQ4DO$$⇒$$20$$−$$2=9$$×$$109$$×$$Q40.25$$⇒$$Q4=0.5$$  nc

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Four point charges Q1, Q2 , Q3 and Q4 are placed at the four corners A, B, C and D of a rectangle having sides 40 cm and 30 cm as shown in figure. Potential at the centre O is found to be 20 volt. If the charge Q4 at corner D is removed, potential at O is found to be 2 volt. Then the value of Q4 is

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