AQA GCSE Magnetic calculations (Combined Science)
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Magnetic Calculations
When a conductor, such as a current carrying wire is placed at right angles to a magnetic field it will experience a force due to the motor effect.
We can calculate the size of the force using the following equation:
Example Calculation
A wire 25 cm in length carries a current of 3 A and is placed in a magnetic field with a flux density of 0.1 Tesla. Calculate the force that the wire experiences.
Convert the length 25cm into metres, 0.25m
Force = magnetic flux density x current x length
Force = 0.1 x 3 x 0.25 = 0.075N
Practice Question
1.Fill in the table below
| Force,F (N) | Magnetic flux density,B (T) | Current,I (A) | Length,l (m) |
|---|---|---|---|
| 0.2 | 5.0 | 0.5 | |
| 2.0 | 8.0 | 0.6 | |
| 4.0 | 0.5 | 10.0 | |
| 6.0 | 0.4 | 0.8 |
2.A wire of length 1.5m wire has a current of 5A flowing along its enitre length. This wire is placed into a magnetic field of strength 0.6 Tesla. Calculate the force that the wire experience
3. A wire of length 75cm experiences a force of 20N when placed in a field of 500 milliTesla. Calculate the current flowing along the wire
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