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P3 4.1c – Student practical sheet Strength of electromagnets Aim To investigate the factors that affect the strength of an electromagnet. Equipment You will need the following equipment: ● ammeter ● low voltage d.c. power supply ● box of paper clips ● soft iron bar or iron nail ● thin cotton-covered copper wire (several metres) ● sticky tape What you need to do 1 2 3 Plan an investigation to determine how the following factors affect the strength of an electromagnet. ● The current in the coil. ● The number of turns of wire in the coil. Your plan should include: ● the apparatus you will use ● how you will measure the strength of the electromagnet ● whether or not you need to carry out any preliminary tests and what these will be ● how you will choose the range and intervals for your independent variables ● how you will make sure your test is fair ● how you will assess the precision and reliability of your results ● what you will do to make sure your investigation is carried out safely Show your plan to your teacher before you start. Using the evidence 1 Record your results in a table and draw a graph. (4 marks) 2 What can you conclude from your results? (2 marks) Evaluation 3 How effective was your method of measuring the strength of the electromagnet? (2 marks) 4 How reliable are your results? (2 marks) Extension 5 Suggest how an electromagnet can be used as an ammeter, and explain how your idea works. (2 marks) Sheet 1 of 1 © Pearson Education Ltd 2011. Copying permitted for purchasing institution only. This material is not copyright free. 337