Two friends made a magnet by wrapping a nail around a wire and connecting the wire to a battery. They each had different ideas about why the magnet worked. Which one do you agree with most?
Kathryn - I think the nail makes the magnet. If we pull the nail out, the magnet won't work anymore. O
Megan - I think it is the wire loops that make the magnet. If you take the nail away, it would still work. ​

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?