Three points charges -6 micro coulomb,10 micro coulomb and -7 micro coulomb are placed conservatively at corners of a square each side of which is 30cm. calculate E at a vacant corner. take k=9.0×10^9 Nm^2C^-2

gravity

explanation:

the force on the thing and the distance the force moves the thing

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.