Cambridge Secondary (7-9). Stage 8. MCE Science. Student Book - Unit 11: Magnetism - Question 33

A student made an electromagnet using the following set-up. Three variables that the student can change are listed below. For each variable, write a hypothesis or question that you could test using the set-up above.

a number of electrical cells

b number of wire coils

c size (voltage) of the electrical cell

Answer part (a): number of electrical cells