I learned $F = iLB$ recently. However, I don't understand why $L$ is marked as a vector but $i$ is not.
For a normal rod, how should I define the direction of length vector $L$? And if I reverse the current in it, the force exerted on it by the magnetic field would reverse direction, correct?
So I think in this formula, $i$ should be the vector but not $L$. Am I right?
I'm using the Physics II by Halliday Resnick and Krane