Question

section 3
materials in the box

4 students in a science class were given a box of materials and asked to use the materials to demonstrate that moving charges can create a magnetic field. from the materials in the box, which can be used together to demonstrate the effect of moving charges?
a the battery, the magnet, and the voltmeter
b the battery, some wire, and the directional compass
c the voltmeter, some wire, and the directional compass
d the battery, the iron nail, and the directional compass

Explanation:

• A battery provides a source of electric current (moving charges).
• When a wire is connected to the battery, current flows through the wire.
• A directional compass can detect the magnetic field created by the moving charges (current) in the wire. A magnet is not needed as the goal is to show the magnetic field from moving charges (not from a permanent magnet). A voltmeter measures voltage and is not relevant for demonstrating the magnetic field from moving charges. An iron nail is used in making electromagnets (a more complex setup than just showing the basic magnetic field from moving charges).

Answer:

B. The battery, some wire, and the directional compass