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I understand current is, however is voltage? As if you increase voltage the current must increase(unless resistance does). However does this mean voltage is 'directly' proportional to magnetic field strength?
 
Things get tricky with magnetic fields ,as you have an inductor , that if things change it may oppose a current in dynamic conditions by generating its own voltage to confuse things. (For inductors we consider current / (and for capacitors we consider voltage -think battery charging))
..Resisting change is like "inertia" in mechanical spring / mass systems..
 
No, in general the magnetic field B is not directly proportional to voltage. A magnetic field arises from and is around moving charge ie a current and not from a potential difference ie a voltage. The higher the current I (that is the greater is the quantity q(charge) x v(charge velocity) the higher is the magnetic field B. Whereas, an electric field is the result of charge alone, whether moving or not, and is in a radial direction relative to it.

Take a look at Ampere's Law for further study.
 
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