The earth's magnetic field

Question

a) is slightly off centre compared to the Earth's rotational axis of rotation
b) has its magnetic south pole at the geographic north pole
c) attracts the north end of the compass needle to the geographic north pole
d) all of the above

Would it be d?

2. A magnetic field line is:
a) a line that shows the direction in which the field is getting smaller
b) a line that points towards the strongest magnetic field
c) a line drawn to represent the direction the magnetic field traces out through space
d) none of the above

would it be c?

3. Which of the following is not an advantage of AC circuits
a) they have the ability to transmit electricity over larger distances, with fewer energy losses
b) They have cheaper and simpler generators
c) they are more reliable systems for adjusting voltage and current
d) they have the ability to run most portable electronics directly from a wall outlet without a transformer

would it be b?

Answer 1

1. a
If you look at a maritime chart you will see that true north is up toward the top of the page but magnetic north is a different direction, here about 17 degrees to the west for example.

Answer 2

2, yes c
3. is D. You need a transformer and rectifier in the little box you plug in to the wall to charge your cell phone.