The Design and Use of Permanent Magnets and Electromagnets
 

The Design and Use of Permanent Magnets and Electromagnets problem 6


A student counts how many iron pins an electromagnet picks up when its power supply is switched on. Then, she counts how many pins are picked up when the power supply is switched off.




She repeats the experiment using cores made of different materials. The results are shown. Which core is made out of soft iron?



 

main author and content editor: Daniel Owoyomi