• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3
4. 4
4
5. 5
5

# Electro-magnetic Induction.

Extracts from this document...

Introduction

Ashley Doherty

Electro-magnetic Induction

Plan

During this investigation I shall be looking at electro-magnetic induction. Electro-magnetic induction happens when a magnet is moved in or near a coil. In order for a current to be induced, the coil has to be part of a complete circuit. Even without a complete circuit, a potential difference is still induced across either end of the coil. Moving a magnet into a coil causes a current to be induced in one direction and then moving it back out of the coil induces a current in the opposite direction.

A voltage can only be induced by the movement of the coil in the magnets magnetic field or the movement of a magnetic field round a coil. If there is no movement, then no voltage will be induced.

There are several different input variables that I could change for this experiment, each one having an effect on the induced voltage. These variables are:

• Strength of the magnet
• Speed the magnet is moving
• Number of turns in the coil
• Area of the cross-section of the coil

The output variable that I am going to measure for the experiment is the voltage that is induced by the input variable.

Middle

Connect crocodile clips to either end of the coil.Connect leads to crocodile clips.Plug leads into voltmeter, creating complete circuit.Place foam-filled tub underneath coil.Place the 30cm ruler next to the coil, making sure that it is resting on the table.Take magnet and hold at the top of the ruler with bottom of magnet in line with top of ruler.Drop magnet through the coil.Record the reading on the voltmeter.Repeat five times with each different coil.

Results

I repeated the experiment five times for each different coil and took the average which gave me more accurate results than if I had only done it one for each.

Conclusion

Evaluation

In my opinion, my method for this investigation worked well, but I feel that there are a few areas that could have been improved.

The most difficult part of the investigation, I felt, to keep reliable was taking the reading on the voltmeter as the magnet passed through the coil. This is because it moved so fast that it was hard to keep track of with my eyes. This may have resulted in some readings being misread. One way of overcoming this problem would be to use a digital voltmeter that clocked the highest reading reached. Another problem with this investigation is dropping the magnet from the same height, as I tended to move the magnet up or down a little by accident and so the magnet was not always dropped from exactly the same height.

Despite these problems I still think that my results are reliable as all my results are pretty similar. Also my results are pretty close to my line of best fit.

This student written piece of work is one of many that can be found in our AS and A Level Fields & Forces section.

## Found what you're looking for?

• Start learning 29% faster today
• 150,000+ documents available
• Just £6.99 a month

Not the one? Search for your essay title...
• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month

# Related AS and A Level Fields & Forces essays

1. ## Investigating a factor affecting the voltage output of a transformer.

I found that with nominal voltages greater than 4Vm, the power supply trips after about five seconds, and so I shall take all my readings after ten seconds, and while this may not give accurate results, it should obtain ones reliable relative to each other.

2. ## Investigate the factors affecting the induced e.m.f. in a coil due to the changing ...

supply, f ), (b) magnetic field strength (current through the solenoid, B), and (c) number of turns of coil N. Theoretically, it is also directly proportional to (d) the induced e.m.f. is increased with increasing area of surface of solenoid A, and (e)

1. ## Stopping distance Investigation.

For example, the height and angle of the ramp will be kept constant throughout, and the metre rules will always be in the same position. The brake will always be placed in the same place, and I will always measure starting and stopping distances from the same point on the trolley.

2. ## To see how the number of coils on an electromagnet affect its strength.

That is exactly what happened in my experiment. Figure 1.0 shows what the paper clips looked like before we picked them up We did not attach the paper clips together We tried the experiment several more times, winding the coils 5 times each to a total of 35 times.

1. ## Elastictvy of Copper investigation

- Also to make sure the experiment is done all at one time to make the results constant. - Also to use the same equipment if I am to repeat the experiment. - Ensure that the variables are appropriately changed Equipment list: > 2 pieces of copper wire > Weights

2. ## What Affects the Strength of Magnetism Exerted By an Electromagnet?

The intensity of the aligning domains could be recorded as loud speakers can pickup the aligning domains. This works because the magnet in the loudspeaker is affected by the aligning domains. Hypothesis I have made this prediction because as you increase the voltage and current, you will induce more domains

1. ## Design of Customer Input Form

So you can apply a character type check to this to ensure that no letters are accidentally typed in. Data type In the design view of the table, there is a heading "Data Type". This allows you to set many different types of validation checks to be performed.

2. ## The aim of this investigation is to establish a connection between the factors and ...

has to neglected until the actual experiment itself, then it could be properly recorded and presented. As a criterion, the other factors have to be kept constant in order to make this a fair test. Here are the variations: 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100

• Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to