Question

1. Say whether each of the following will make the electromagnet stronger, weaker or have no effect: 
2. Increasing the number of turns of wire. Stronger
3. Decreasing the current passing through the wire.
4. Putting the nail into the coil from the  opposite direction

Answer 1

1. Increasing the number of turns of wire. Stronger;
2. Decreasing the current passing through the wire. Weaker;
3. Putting the nail into the coil from the opposite direction. Have no effect.