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

Using a search coil and CRO to investigate the magnetic fields generated by alternating currents (A.C.) through a straight wire and a slinky solenoid.

Extracts from this document...

Introduction

Name: Pyrrhus Choi Tsz Kiu                               Date: 01-03-2010
Class: 6S    Class no.: 8                                 Marks:     /10

C15. Investigation of Magnetic Fields by Search Coil (Brief Report)

In the report, all the number will be taken in exact or 3 sig. fig.

Objective: Using a search coil and CRO to investigate the magnetic fields generated by alternating currents (A.C.) through a straight wire and a slinky solenoid.

Part A. Magnetic field around straight wire
Measuring the magnetic field generated 2cm away from the centre of the straight wire by search coil.
Result Table of the Induced E.M.

...read more.

Middle

From the above V-t graph, the curve is a straight line passes through origin. Hence, the potential difference across the capacitor is directly proportional to the time for the CRO trace to rise in steps of 1V and the slope (image01.png) which represented the charging rate, is constant.
Relationship between the charge stored in the capacitor and the potential different across it when the charging current is constant

The area of the graph (Vt) represented the charge stored in the capacitor. As the rate of change of potential, it implies the charge stored in the capacitor increase with potential, thus the charge stored in the capacitor directly proportional to the potential difference across the capacitor when the charging current is a constant.

...read more.

Conclusion



2. Systematic Error
Adjustment of current
In the experiment, we need to keep the charging current constant as I, i.e.80μA by hand. However, the rate of the decrease of the current is not constant. When the potential difference across the capacitor becomes larger, the rate of the decrease of the current will increase too. It is difficult to adjust the current constant as I.

Reaction time
We mark the time taken of the CRO trace to rise in steps of 1V. If the reaction time of the timer is large, the measurement will be less accurate. And the average reaction time of human is 0.02s
Hence,
Maximum percentage error of the measurement of time: image03.png× 100% = 0.227%
Improvement
Both of them can be improved by practicing the task in the experiment.





                            -End of report-

...read more.

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

See related essaysSee related essays

Related AS and A Level Fields & Forces essays

  1. Investigating the relationship of projectile range and projectile motion using a ski jump.

    There are different things that I could change to improve the accuracy of the experiment. I can put a gate as a releasing barrier at the point of dropping the ball baring to ensure that it is being released at the same point every time.

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

    found ( is not as what is predicted (. However, it is still roughly found that the induced e.m.f. has been decreased with decreasing angle. DISCUSSIONS Question In investigating the relationship between the induced e.m.f. and area of coil, the two solenoids have same magnetic field.

  1. Free essay

    Investigating the Damping of Motion in a Simple Pendulum through Induced Eddy Currents

    One possible explanation for this would be to do with the fact that the metals have very different densities. Because of the differences in densities between the metals, it was impossible to keep constant both the volume and the mass.

  2. Objective of Experiment. To use a search coil and CRO to investigate ...

    Steps were repeated by using increasing current. The centre of the search coil was placed 1cm away from the wire. CRO was adjusted such that the vertical trace occupied the full height of the screen. The distance of the search coil from the wire was increased in steps and the length of the vertical trace on the CRO was measured.

  1. Practice A2 Investigation: Measuring the torsion of wire

    of the wire, as human reaction time is essentially unavoidable and is only a very small uncertainty regardless. I made sure the Moment of Inertia was constant by using the same torsion bar throughout the investigation. After collecting the data I then had to rearrange the formula of the period to make the torsion constant the subject.

  2. charging a capacitor at a constant rate(C08)

    Repeat the procedure but this time start the stop-watch and continuously adjust the potentiometer to keep the current, 70´┐ŻA, constant as the capacitor charges up. 6. Measure the times for the CRO trace to move up by 1cm, 2 cm, 3 cm, 4 cm, 5cm and 6cm.These are the

  1. EMF Investigation - electricity and magnetic fields.

    Using a signal generator and varying the current passing through the electromagnet respectively could do this. The voltages that the power pack can supply are 0, 2, 4, 6, 8, 10 and 12 V. The maximum amps that it can go up to is 0.30A, so the exact current measurement

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

    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
    improve your own work