When electricity flows through a coil of wire, what does the resultant magnetic field resemble?
a. the magnetic field of a bar magnet.
b. the magnetic field of a horseshoe magnet.
c. the magnetic field around a straight wire.
d. the magnetic field around a circular magnetic disc.

Which statement best describes resistance? resistance is a. how well a current will flow in a material and is measured in volts. b. how well a material conducts an electrical charge and is measured in ohms. c. the ability of a material to attract a positive charge to create a current. d. the ability of a material to repel neutral charges and is measured in ohms.

Let f(x) = x4- 8x2 . find the relativeextrema of this function using the second derivative test.

How do you tell if someone actually cares about you? and just say they do?