A car sitting still
The distance is not changing which means the car is not moving
Change the core from wood to iron. This is because iron is a magnetic material while wood is not magnetic hence cant acquire magnetism. Other factors that would increase the strength of electromagnet would be; increasing the amount of electric current, and increasing the number of winding's.
You can find it by adding the standard atomic masses of the constituent atoms.
Since power, P, equals iV, P/V = i, so at 120 V, a 40-watt bulb draws 1/3 A.
