justin loves to make electromagnets in his spare time. he wanted to teach his friend jimmy about what the iron core of an electromagnet does. what is the best explanation?
a) it is a conductor that allows more current to flow through the electromagnet.
b) it produces a magnetic field that adds to the overall magnetic field of the electromagnet.
c) it is an insulator that protects people from getting shocked.
d) it produces a current that passes through the coil.

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?

Aman is trying to drag a small tree that he cut down. if the static coefficient of friction of the tree on the ground is 0.5 and the tree weighs 670 n, what is the minimum amount of horizontal force that the man will need to apply so that the tree will start moving? o a. 465 n o b. 230 n o c. 670 n o d. 335 n

Can a molecule have bond dipoles but not have a molecular dipole?