- #1
Amr Elsayed
- 90
- 3
Hello all,
I know that the force due to magnetic field on a wire containing current = the length of that wire* the current intensity x magnetic field upon that wire, but I fail to understand where the "the length of that wire* the current intensity" comes from or why it's even there.
Sometimes I see it replaced by Q*V. You may say this actually equals Q* d/t which is the same as I*L, but this doesn't appear to be the case because Q/t here is meant to be the charge passing through a certain length " not equal to zero" in a certain amount of time. The problem stems from the definition of current intensity. it's said to be the charge passing through a cross section per second, and it appears to be just that sample. However, cross section without defining a thickness makes no sense to me.
I just need some explanation for why Q*V is the same as I*L and why do we have to cross product them with magnetic field. A fulfilled physical definition of force due to magnetic field might help.
I hope you understand my problem
Regards
I know that the force due to magnetic field on a wire containing current = the length of that wire* the current intensity x magnetic field upon that wire, but I fail to understand where the "the length of that wire* the current intensity" comes from or why it's even there.
Sometimes I see it replaced by Q*V. You may say this actually equals Q* d/t which is the same as I*L, but this doesn't appear to be the case because Q/t here is meant to be the charge passing through a certain length " not equal to zero" in a certain amount of time. The problem stems from the definition of current intensity. it's said to be the charge passing through a cross section per second, and it appears to be just that sample. However, cross section without defining a thickness makes no sense to me.
I just need some explanation for why Q*V is the same as I*L and why do we have to cross product them with magnetic field. A fulfilled physical definition of force due to magnetic field might help.
I hope you understand my problem
Regards