Two identical point charges Q are placed each diagonally opposite corners of a square (1.0 m on a side).The magnitude of the electric field at either of the two unoccupied corners is 19.1 N/C.The absolute value of the charge Q is

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The correct answer is A because the electric field at the unoccupied corners is given by:E = k * Q / r^2where k is Coulomb's constant, Q is the charge, and r is the distance between the charge and the unoccupied corner.In this case, r = 1.0 m and E = 19.1 N/C.So, Q = E * r^2 / k = 19.1 N/C * (1.0 m)^2 / (9.0 * 10^9 N m^2/C^2) = 1.5 nC.

Two Identical Point Charges Q Are Placed Each Diagonally Opposite