How have we described the main sequence of a stars? a) they are only red giant
b) they change according to the main sequence and change from red to yellow to Blue as they live
c) they are only average
d) the group of average stars that are like average adult people. some are big or small, bright or dim, hot or cold.​

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?