1. Resistors in series have a total resistance
a. greater than any individual resistor
b. smaller that any one individual resistor
c. smaller than if they were all wired parallel to each other
d. none of these
2. ____ magnetic poles attract, and _____ magnetic poles repel.
a. like, opposite
b. opposite, opposite
c. like, like
d. opposite, like
3. A magnetic field is represented by a group of exes on the page, with an arrow to the right representing the velocity of a proton. How would the force exerted by the magnetic field be shows?
a. an arrow pointing to the bottom of the page
b. an arrow pointing to the top of the page
c. a bunch of dots on the page
d. an arrow pointing to the left
4. The earth has a magnetic field because of
a. of convection currents in the outer iron core
b. little magnetism elves work day and night aligning the magnetic domains
c. the electrons of all the elements in the earth spin the same direction
d. gravity
5. As the number of coils around an iron core increase, the magnetic field
a. strength increases
b. strength stays the same
c. strength decreases