5) An electron beam in the middle of a set of Helmholtz coils shows that the electrons travel along a circular trajectory. What is the feature of the magnetic fields in a set of Helmholtz coils that lends itself to this demonstration? Select the best answer.

Group of answer choices

a- The field is uniform.

b- The field is triangular.

c- The field is circular.

d- The field is elliptical.

6) When iron filings are sprinkled on a sheet of paper to demonstrate the magnetic fields of a bar magnet underneath the paper, do they tell you where the north and south poles of the bar magnet are?

Group of answer choices

a- The iron filings are too randomly aligned to allow one to tell where the poles are.

b- Only the south pole of the bar magnet is discernable based on the iron filings' pattern.

c- One can only tell where the two poles are, not which is which.

d- The iron filings distinctly point towards where the north pole of the bar magnet is.

7) If a 0.6 A light bulb powered by 120-V runs for a whole day, how many kilowatt-hours does it use in that day? Note that 1.0 kWh = 3.6 x 10⁶ J. Round your answer to the nearest tenth.