a student made an electromagnet using an iron nail, copper wire, a battery, and a switch as shown in the…

a student made an electromagnet using an iron nail, copper wire, a battery, and a switch as shown in the diagram. the student used the electromagnet to pick up three safety pins. the student would like to be able to pick up eight safety pins. what action should the student take to accomplish this? a reverse the direction of the poles of the iron nail b adding a resistor between the battery and the switch c replace the iron nail with one made out of plastic d increase the number of coils of copper wire

a student made an electromagnet using an iron nail, copper wire, a battery, and a switch as shown in the diagram. the student used the electromagnet to pick up three safety pins. the student would like to be able to pick up eight safety pins. what action should the student take to accomplish this? a reverse the direction of the poles of the iron nail b adding a resistor between the battery and the switch c replace the iron nail with one made out of plastic d increase the number of coils of copper wire

Answer

Brief Explanations:

The strength of an electromagnet is related to the number of wire - coils, the current flowing through the wire, and the magnetic properties of the core. Reversing the poles doesn't change strength. Adding a resistor reduces current and thus weakens the magnet. Plastic is non - magnetic and won't work as a core. Increasing the number of coils increases the magnetic field strength, allowing it to pick up more safety pins.

Answer:

D. Increase the number of coils of copper wire