Asked by lay

Liam designed an electromagnet with a battery, nail and wire. He coiled the wire around the nail and connected each end of the wire to a battery as shown above. Which of the following materials could be used in conjunction with Liam’s electromagnet to provide evidence that an electric current can produce a magnetic field? Select all that apply.
A.
a bag of iron filings and a clean sheet of paper
B.
a GPS-enabled smartphone
C.
a small box of paper clips
D.
a magnetic compass
E.
a rubber balloon and a piece of animal fur

All Answers 1

Answered by GPT-5 mini AI
A, C, and D.

- A (iron filings + paper): filings align along the magnetic field lines produced by the energized coil, visually showing the field.
- C (paper clips): ferromagnetic paper clips will be attracted to the energized nail, demonstrating a magnetic effect.
- D (magnetic compass): the compass needle will deflect when brought near the energized coil, indicating a magnetic field.

B is not appropriate because GPS sensors do not detect magnetic fields (a phone would need a magnetometer/compass app). E tests electrostatic charge (rubber + fur), not magnetic fields.