Magnetism

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__**Find the blank - revision activity**__
= = == == =__**Magnetism**__=

__**Practical 1 - plotting field lines**__

Practical 2 - making magnets

__** Equipment list **__ ★ Large nail ★ Plotting compass ★ Permanent magnet ★ Wire for making coil (various lengths, with ends stripped) ★ Crocodile clips ★ Connecting wires ★ Power supply and current limiting resistor (lamp) ★ Press switch ★ Ammeter ★ Pencil ★ Paper clips

__** Safety **__

Take care with nails. Do not let the wire get hot when you pass current through it. Fumes from burning plastic are harmful. So try this

__** Method (part 1) **__

1) Take a nail and, using a compass, test to see whether it is already magnetic. <span style="font-family: 'Comic Sans MS'; font-size: 14px; font: normal normal normal 11.5px/normal Helvetica; margin: 0px;">2) You can make its magnetism stronger, or reverse its magnetism. Stroke the pole of a permanent magnet along the nail several times. <span style="font-family: 'Comic Sans MS'; font-size: 14px; font: normal normal normal 11.5px/normal Helvetica; margin: 0px;">Check, using the compass, to see whether its magnetism has changed.

__** TO DO **__ Draw a diagram to show how you stroked the nail. Write down what happened.

<span style="font-family: 'Comic Sans MS'; font-size: 14px; font: normal normal normal 13px/normal Times; margin: 0px;">3) Take a length of wire and wind it around a pencil to make a coil. <span style="display: inline !important; font-family: 'Comic Sans MS'; font-size: 14px; font: normal normal normal 11.5px/normal Helvetica; margin: 0px;">4) Connect it into a circuit with a power supply, lamp and a press switch. Hold the compass near to the coil and turn the circuit on and off.

<span style="display: inline !important; font: normal normal normal 11.5px/normal Helvetica; margin: 0px;">__** SAFETY **__ <span style="display: inline !important; font-family: 'Comic Sans MS'; font-size: 14px; font: normal normal normal 11.5px/normal Helvetica; margin: 0px;">Only turn the current on for a second or two each time.

<span style="display: inline !important; font: normal normal normal 11.5px/normal Helvetica; margin: 0px;">__** TO DO **__ Draw a diagram and label it: What have you made?

__** Method (part 2) **__

<span style="display: inline !important; font-family: 'Comic Sans MS'; font-size: 14px; font: normal normal normal 11.5px/normal Helvetica; margin: 0px; padding: 0px;">You can ‘measure’ the strength of a magnet or electromagnet by the number of small pieces of paper clips it can pick up

Title: __** Investigation to determine the factors which effect the strength of an electromagnet **__

<span style="display: inline !important; font-family: 'Comic Sans MS'; font-size: 14px; font: normal normal normal 13px/normal Times; margin: 0px; padding: 0px;">You will need to write up this part of the investigation using the following subheadings:

__** PREDICTION **__ __** METHOD **__ __** RESULTS **__ __** CONCLUSION **__

__** TO DO **__ Predict: What do you think will happen to the strength of your electromagnet when you:

<span style="font-family: 'Comic Sans MS'; font-size: 14px; font: normal normal normal 11.5px/normal 'Zapf Dingbats';">★ use different lengths of wire to make coils with different numbers of turns (or loops)? <span style="font-family: 'Comic Sans MS'; font-size: 14px; font: normal normal normal 11.5px/normal 'Zapf Dingbats';">★ put a nail into the centre of the coil?

<span style="font-family: 'Comic Sans MS'; font-size: 14px; font: normal normal normal 11.5px/normal Helvetica; margin: 0px;">Carry out investigations to find out if you <span style="display: inline !important; font-family: 'Comic Sans MS'; font-size: 14px; font: normal normal normal 11.5px/normal Helvetica; margin: 0px;">were right.

__** TO DO **__ <span style="font-family: 'Comic Sans MS'; font-size: 14px; font: normal normal normal 11.5px/normal Helvetica; margin: 0px;">Write down what you did (method) <span style="font-family: 'Comic Sans MS'; font-size: 14px; font: normal normal normal 11.5px/normal Helvetica; margin: 0px;"> Write down any data gathered (results) <span style="font-family: 'Comic Sans MS'; font-size: 14px; font: normal normal normal 11.5px/normal Helvetica; margin: 0px;"> Write down what you found out.(conclusion)


 * __ QUESTION: __** There is one other way to increase the strength of an electromagnet what do you think it is?

[|Magnet and Electromagnet simulation.]

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__**<span style="font-family: arial,helvetica,sans-serif; font-size: 13px; line-height: 19px;">HOMEWORK 1 **__
 * __ - You will present your report to the class next lesson __**

__**Magnetic shielding Investigation**__
Use the diagram below to help you to plan an investigation into magnetic shielding. There are a number of different materials to investigate!! __**Method**__ Write a method in your book (you may refer to this diagram) State what is the Independant variable and what is your chosen dependent variable? State what you will keep the same in order to make it a fair test.

__**Results**__ Draw a suitable table to record your results.


 * __Conclusion (your conclusion should address the following questions)__**

1) Which material shielded the magnetic field from the paper clip the best, say why you think this?

2) How did the thickness of the material affect how much magnetic field passed through the material?

3) What do you think happens to the magnetic field when it is ‘stopped’ by a material?

4) Which 3 metals in the periodic table do you think would best stop the magnetic field?