# Magnetic Field/Magnetic Force/Current

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#1
I've learnt that the magnetic field strength (B) can be increased by increasing the current (I). What's the equation related to this? According to F=BIL when the current decreases, magnetic field strength increases..
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10 months ago
#2
Biot-Savart law
http://hyperphysics.phy-astr.gsu.edu...Biosav.html#c1
B is proportional to I
Last edited by BobbJo; 10 months ago
0
10 months ago
#3
(Original post by Ellie.Ginger)
I've learnt that the magnetic field strength (B) can be increased by increasing the current (I). What's the equation related to this? According to F=BIL when the current decreases, magnetic field strength increases..
Note that the current that appears in the F = BIL and the magnetic flux density (or magnetic field strength) B is different.

To find the magnetic flux density (or magnetic field strength) B generated by a current I, we can use what is known as Biot-Savart law to compute it but this is NOT required in A level.

https://en.wikipedia.org/wiki/Biot%E2%80%93Savart_law

It would be good that you know that a few expressions on the magnetic field due to various common current distribution and you can see that magnetic flux density is directly proportional to current. The expression can be derived using Biot-Savart law.
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