Based on the reactivity series for a few different metals.

What combination of metal will produce the highest voltage?

The correct answer is:

The battery that has the combination of Mg and Cu produces a high voltage current.

• Magnesium and copper are the most and least reactive metals, respectively, according to the table provided in the question.
• The electrochemical potential difference between the metals is directly related to the difference in metal reactivity.
• Electric current is generated between the two metals.
• Magnesium can more effectively repel electrons than copper because it is higher up the electrochemical series than copper.
• From the magnesium to the copper, electrons move along the wires and through the voltmeter.
• The voltage produced increases with the electrochemical potential difference because the least reactive metal readily accepts the electrons while the most reactive metal readily gives up its electrons.