Magnetic Field/Magnetic Force/CurrentWatch
B is proportional to I
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..
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.
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.