[单选题]
Two charges are separated by a distance d and exert mutv,pwn *o 5w* ybz98;mkkdsp. sual attractive forces oyd/p;fc4 hmu wc(0d) tf F on each other. If the charges are separated by a distance of d/3, what adct cw( /pu0;h4my)f dre the new mutual forces?
