1) The force on a charged particle moving through a magnetic field is greatest when the angle between the particle's velocity and the magnetic field is...

Group of answer choices

45.

60.

90.

0.

30.

2) Which of the following would NOT have a magnetic field surrounding it?

Group of answer choices

an electron moving at some constant non-zero velocity

a long wire carrying a constant current

a single iron atom

a neutron at rest

a loop of wire carrying a constant current

3) Which rare-earth element's alloys are used to make very strong permanent magnets?

Group of answer choices

iron

copper

neodymium

nickel

cobalt

4) Magnetic __________ __________ always form closed loops with no beginning or end.

5) Metals, such as iron, nickel, and cobalt, that exhibit strong magnetic effects are said to be __________________________.

6) A step-up ________________________ is used at a power plant to greatly reduce the electrical current for power transmission, thus reducing any heat losses in the wires.

7) When an inductor is shorted through a resistor, the current drops off exponentially.

Group of answer choices

True

False

8) How can the motion of a charged particle reveal the presence of either field?

9) Why are electromagnets used in an MRI machine rather than permanent magnets? Give at least two physics-related reasons why.

10) Given what you know about AC circuits, why should that particular circuit element be placed in series with the rest of the circuit instead of parallel with it?