[单选题]
Two charges are separate0 )cklrrw x8,kd by a di bhncz ir0o))6e;.rt-ce/ gq: 0uc;s c6nrdqnstance d and exert mutual attractive forces of F on each other. If the charges are separated by a distance of d/3, what are the new mutua g6)qe hcqi00cbtuc6/-o) nn. ez:;nr rscrd;l forces?
