Which of the following would increase the strength of an electromagnet?
check all that apply.
a. increasing the current flow
b. putting a piece of iron inside the loops of wire
c. increasing the number of loops of wire
d. spinning the loops
e. straightening the wire

A. Increasing the current flow

B. Putting a piece of iron inside the loops of wire

C. Increasing the number of loops of wire

Explanation:  An electromagnet is a device which has conducting wire coiled around a piece of metal usually an iron core. The metal acts as a magnet when current passes through the wire. The strength of the magnetic field depends upon the amount of current and number of loops of the coiled wire. Thus, if a piece of iron is placed inside the loops of wire, current is increased and number of loops is increased, the magnetic field strength increases.

their crystal patterns have been disrupted by stress

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west