• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Factors affecting an electromagnet

Extracts from this document...

Introduction

Raghav Ramabadran

SPH4U7-01

January 15th 2009

Sharbaf Ebrahimi

Design Lab 12: Factors affecting the strength of an Electromagnet

Purpose

This investigation is focusing on introducing as well as critically analyzing the factors that affect the strength of an electromagnet. In turn, as the factors are being investigated, students have to establish a relationship between the strength of the electromagnet to the number of paperclips that the electromagnet can hold. An electromagnet is a magnet consisting essentially of a coil of insulated wire wrapped around a soft iron core that is magnetized only when current flows through the wire. An Electromagnet can be made by taking an iron nail and wrapping it with an insulated wire, as when the current is running through the insulated wire there will be a magnetic field produced by the Electromagnet. Essentially any iron material or metallic material can act as an electromagnet along with a magnet.  If the wire is not insulated, then the nail wrapped around by a normal wire that is not insulated will not work. In addition, a failure is guaranteed if any of the wires are touching each other as the electromagnetic will fail to act properly. As with all other physics concepts, there is a calculation involved. The strength of the electromagnet can be obtained through the formula: B = (μNI)/ L. In this equation, B is the value for the strength of the magnetic field in Tesla (T), μ is a constant which has a value of (4π x 10-7)

...read more.

Middle

Iron Nail with a constant lengthPaper ClipsPaper and a writing utensil to record the dataAlligator clips to connect the circuit

Procedure

When keeping the # of turns constant:

  1. Take the nail and coil it around with insulated wire and make sure that the distance between the turns is constant and keep circulating for 7 turns.
  2. Pick out one battery, an Ammeter, and the nail with the coiled wire.
  3. Connect them in a series circuit and check the current. Attempt to add as many paperclips as possible to the iron nail with the insulated wire which is now acting as an electromagnet.
  4. Record the results and add another battery to the series, and check the current. Once again attempt to place as many paperclips as you can on the Electromagnet, and record the results.
  5. Redo steps 3 and 4 by adding more batteries one by one each time, checking the current, and checking how many paperclips the Electromagnet can hold. The maximum and final amount of batteries that should be used is 7.
  6. Now that all the data has been obtained, process the data by drawing a data chart and graph the points. On the graph, draw the line of best fit, and give the graph the title: “Graph to show Current vs. Paperclips graph.”

When keeping the current constant:

  1. Pick up one 1.5 volt battery and form a series circuit connecting the alligator clips from the battery to the wire on the nail.
  2. Start with 7 turns on the nail, as this will be the initial amount of turns on the nail.
...read more.

Conclusion

Discussion Questions

  1. Was there any other factors that could be tested for, and if there are what is it and how can it be tested?
  2. What can we conclude from the slopes of both graphs? Explain your reasoning.
  3. What does happen when more turns were coiled onto the nail? Does the amount of paperclips increase or decrease as you add more turns? Explain why it increases or decreases?
  4. What does happen when more current was running around the series circuit? Does the amount of paperclips increase or decrease as you add more current into system? Explain why it increases or decreases?
  5. What types of uncertainties were present in your experiment and how could they be reduced or prevented next time?

Conclusion and Evaluation

Upon completion of the lab, students should have acquired a more than rough idea of how electromagnets work and what factors can be increased/decreased to enhance/increase the intensity of the magnetic field. Students are now asked to write a formal conclusion with proper justification based on interpretation of the data that they have gathered. It is important that students figure out if their hypothesis was correct or not and if not, explain why. As in all labs, it is important to evaluate the weaknesses and limitations of the labs as well as suggesting realistic improvements to increase accuracy and eliminate as many errors as possible.

...read more.

This student written piece of work is one of many that can be found in our International Baccalaureate Physics 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

See related essaysSee related essays

Related International Baccalaureate Physics essays

  1. Investigate the factors affecting the period of a double string pendulum

    I conclude that in almost all certainty that my hypothesis was correct and sound. The second graph you can see the trend line has an equation of y=0.114x2 -1.238x+2.016 corresponding with the negative downward sloping of trend line establishing that the relationship between the distance l and the period of the oscillating metal bar are inversely related to one another.

  2. Current Balance Lab - investigate how a magnetic field affects a wire carrying an ...

    the magnetic field strength per ampere inside the solenoid, B, will also increase. Variables: The independent variable in this experiment, or what we will be altering throughout, will be the amount of current we allow through the wire/solenoid. This will be regulated with the use of a power supply and a transformer.

  1. Verification of the earth's gravitational field strength

    Length of pendulum string (L)/ m (�0.01m) Period (T�)/s (�2s) Constant (K) G( gravitational strength)/ms-2 (�2.01 ms-2) 0,5 2,24 4,48 8,82 1,0 4,27 4,27 9,24 1,5 6,22 4,15 9,52 2,0 8,24 4,12 9,58 Data presentation: If we draw a graph with T2 on the y-axis and L on the x-axis we may see a linear correlation.

  2. design of a variable resistor

    We found out that the thinnest copper wire, which has diameter of mm has average resistance of 0.06174412, the medium thickness copper wire, which has the diameter of mm has average resistance of 0.059712123, and the thickest wire, which has diameter of mm has average resistance of 0.05657483.

  1. Investigating Wires

    the current to pass, reducing resistance, therefore the thickness has to be kept constant. Brand of nichrome wire Controlled We will use the same nichrome brand for the entire experiment. This is because different brands of nichrome wires may have different electrical resistances per unit length.

  2. Light Intensity Investigation

    The readings that the light sensor receives will show up on our laptops and will be the basis for our data that will be measured in the unit LUX. Averages for each distance will be calculated by applying a simple formula where all three trials are added up, before the

  1. HL Physics Revision Notes

    Horizontal component: No forces in the horizontal direction, i.e. no acceleration i.e. constant velocity. Vertical component: There is a constant vertical force acting down (gravity) The effect of air resistance on the trajectory of a projectile: The path is no longer parabolic The maximum height and range decreases The angle at which the projectile impacts the ground steepens Gravitational

  2. IB Physics Design Lab - Does the temperature a bar magnet is exposed to ...

    To maintain accuracy, I will be using the same gaussmeter (which I have built) to measure all values for magnetic field strength of a magnet. Presence of External Magnetic and Electric Fields Near Magnet The presence of external magnetic and electric fields can lead to the strengthening or weakening of the magnetic field being investigated.

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