PhysicsMedium46×since 2002Q6952Four charges equal to -QQQ are placed at the four corners of a square and a charge qqq is at its center. If the system is in equilibrium the value of qqq isA−Q2(1+22)- {Q \over 2}\left( {1 + 2\sqrt 2 } \right)−2Q(1+22)BQ4(1+22){Q \over 4}\left( {1 + 2\sqrt 2 } \right)4Q(1+22)C−Q4(1+22)- {Q \over 4}\left( {1 + 2\sqrt 2 } \right)−4Q(1+22)DQ2(1+22){Q \over 2}\left( {1 + 2\sqrt 2 } \right)2Q(1+22)Check answerSkip