<span>background information hope this helps</span>
Answer:B
Explanation:Coefficient represents the number of units of each substance.
The simplified model of the hall effect proved that the current (electric) in metals are carried by electrons and not protons. The hall effect introduced the hall coefficient which is the ratio of the induced electric field to the current density x applied magnetic field. This coefficient is unique for each type of metal.
Answer:
copper has 2+ ions in a sample of copper
