Seorang kanak-kanak bermain bola di luar rumahnya. Apabila dia melambung bola ke atas, bola tersebut akan terjatuh semula ke tanah. Mengapa ? A Daya pecutan menarik bola tersebut ke tanah.
B Bola menarik Bumi mendekatinya.
C Daya graviti Bumi menarik bola tersebut ke tanah.
D Bola dan Bumi saling menarik

The dipole moment of the water molecule (h2o) is 6.17x10^-30 c.m. consider a water molecule located at the origin whose dipole moment p points in the +x-direction. a chlorine ion ( of charge-1.60x10^-19c , is located at x=3.00x10^-9m . assume that is much larger than the separation d between the charges in the dipole, so that the approximate expression for the electric field along the dipole axis can be used. a) find the magnitude of the electric force that the water molecule exerts on the chlorine ion. b) what is the direction of the electric force. -x-direction or +x-direction c) is this force attractive or repulsive?