Difference between revisions of "Motor Effect"
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<math>F \approx 1.0\times 10^{-2}N</math> | <math>F \approx 1.0\times 10^{-2}N</math> | ||
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+ | ===References=== | ||
+ | ====AQA==== | ||
+ | |||
+ | :[https://www.amazon.co.uk/gp/product/1471851370/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851370&linkCode=as2&tag=nrjc-21&linkId=01c69b0ae058f809cf636033e6ba793e ''Motor effect, page 228, GCSE Physics, Hodder, AQA ''] | ||
+ | :[https://www.amazon.co.uk/gp/product/0008158770/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158770&linkCode=as2&tag=nrjc-21&linkId=ec31595e720e1529e49876c3866fff6e ''Motor effect, page 249, GCSE Physics; Student Book, Collins, AQA ''] | ||
+ | :[https://www.amazon.co.uk/gp/product/019835939X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=019835939X&linkCode=as2&tag=nrjc-21&linkId=57e96876985fc39b1a3d8a3e3dc238b6 ''Motor effect, pages 220-221, GCSE Physics; Third Edition, Oxford University Press, AQA ''] | ||
+ | :[https://www.amazon.co.uk/gp/product/1782946403/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946403&linkCode=as2&tag=nrjc-21&linkId=32a0abb60dff015b15b50e9b1d7b4644 ''Motor effect, pages 221-227, GCSE Combined Science Trilogy; Physics, CGP, AQA ''] | ||
+ | :[https://www.amazon.co.uk/gp/product/1471851362/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851362&linkCode=as2&tag=nrjc-21&linkId=7d78d70a2044ee9982dae010c94af92a ''Motor effect, pages 281, GCSE Combined Science Trilogy 2, Hodder, AQA ''] | ||
+ | :[https://www.amazon.co.uk/gp/product/1782945970/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945970&linkCode=as2&tag=nrjc-21&linkId=a120d24dcc7cc7a58192069a3aafc1d2 ''Motor effect, pages 295-302, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA ''] | ||
+ | :[https://www.amazon.co.uk/gp/product/178294558X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=178294558X&linkCode=as2&tag=nrjc-21&linkId=f0dfb66dafcb0c6e9449e7b1a4ae1ac320 ''Motor effect, pages 94, 95, GCSE Physics; The Revision Guide, CGP, AQA ''] |
Revision as of 10:07, 9 November 2019
Contents
Key Stage 4
Meaning
The motor effect is the force on a current carrying wire in a magnetic field.
About The Motor Effect
- When an a wire has an electrical current it has a magnetic field. If this wire is in the presence of an external magnetic field the two fields will interact causing a force.
- The magnitude of the force depends upon:
- The Current - The greater the current the greater the force.
- The Magnetic Field - The greater the strength of magnetic field the greater the force.
- The force on a current carrying wire is at right angles to both the current and the magnetic field.
- Fleming's Left Hand Rule can be used to find the direction of the force.
\(\overrightarrow{B}\): First finger field. \(\overrightarrow{I}\): Second finger current. \(\overrightarrow{F}\): The force. |
The direction on the force on this wire can be found using Fleming's Left Hand Rule. |
Equation
Force = (Magnetic Flux Density) x (Current) x (Length)
\(F = BIl\)
Where
\(B\) = The Magnetic Flux Density (strength of magnetic field).
\(I\) = The Electrical Current through the wire.
\(l\) = The length of wire inside the magnetic field.
\(F\) = The force on the wire.
Example Calculations
A wire carrying a current of 2.3A is inside a 55mT magnetic field that extends along the wire by a length of 6.1cm. Calculate the force on the wire correct to two significant figures. | 23cm of wire carrying 1.2A of current is contained in a 37mT magnetic field. Calculate the force on the wire correct to two significant figures. |
1. State the known quantities in SI Units.
\(B\) = 55mT = 55x10-3T \(I\) = 2.3A \(l\) = 6.1cm = 6.1x10-2m |
1. State the known quantities in SI Units.
\(B\) = 37mT = 37x10-3T \(I\) = 1.2A \(l\) = 23cm = 23x10-2m |
2. Substitute the numbers into the equation and solve.
\(F = BIl\) \(F = 55\times 10^{-3} \times 2.3 \times 6.1 \times 10^{-2}\) \(F = 7.7165 \times 10^{-3}N\) \(F \approx 7.7\times 10^{-3}N\) |
2. Substitute the numbers into the equation and solve.
\(F = BIl\) \(F = 37\times 10^{-3} \times 1.2 \times 23 \times 10^{-2}\) \(F = 1.0212 \times 10^{-2}N\) \(F \approx 1.0\times 10^{-2}N\) |
References
AQA
- Motor effect, page 228, GCSE Physics, Hodder, AQA
- Motor effect, page 249, GCSE Physics; Student Book, Collins, AQA
- Motor effect, pages 220-221, GCSE Physics; Third Edition, Oxford University Press, AQA
- Motor effect, pages 221-227, GCSE Combined Science Trilogy; Physics, CGP, AQA
- Motor effect, pages 281, GCSE Combined Science Trilogy 2, Hodder, AQA
- Motor effect, pages 295-302, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA
- Motor effect, pages 94, 95, GCSE Physics; The Revision Guide, CGP, AQA