Why does alternating current change direction 50 to 60 times per second?
a) because it is produced by a generator that changes current direction as it spins
b) because magnetic fields from the generator attract and repel the current
c) because it travels at the speed of light back and forth across the circuit
d) because it can only travel a short distance before being attracted back to where it started

What is the order of the moon, earth, and sun in a lunar eclipse and a solar eclipse?

Which body part transports oxygen removes waste materials in carries nutrients to the body as part of the circulatory system

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?