F10.2
How do you make
electromagnets stronger?
Name
Class
Date
Method
Apparatus
• insulated conducting wire
• iron nail
• paper clips
• low voltage power pack
•
•
•
•
A Set up the circuit shown on the
right.
B Hold the end of the electromagnet
over a pile of paper clips. Find out
how many paper clips the
electromagnet can pick up with
different currents. Record your
results in the table below.
connecting wires
crocodile clips
voltmeter
switch
A
30 coils
iron nail
crocodile clip
crocodile clip
Results
1 Record your results in this table.
Current (A)
Number of paper clips
2 Plot your results on the graph paper below. Take care labelling the axes.
Conclusions
3 a) Describe the shape of your graph.
b) What happens to the strength of the electromagnet as you increase the current flowing through it?
© Pearson Education Limited 2003
397
Longman Higher Science for GCSE 1
F