Electrical motors work based on the fact that a wire carrying current can produce a field, which can lead to production of mechanical energy through rotation. A gravitational B parallel C magnetic D alternating

It’s C magnetic field because with the forces of the magnets pushing against each other it gets the engine to start turning the wheels.

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na