1. The problem statement, all variables and given/known data > Figure 1: > > A spool is hung on a spring. A part of the coil hangs in front of a > homogeneous magnetic field. The coil is incorporated in an electrical > circuit. See Figure 1. > > the coil KLMN has a rectangle shape, has a height of 10.0 cm, a width > of 8.0 cm, and has 200 windings of which two are shown in Figure 1. > > The electrical circuit comprises a power supply, a sliding resistance > and the coil, connected in the manner shown in Figure 1 > > > The distance between the bottom of the coil and the borders of the > magnetic field is referred to as y. See Figure 1. If the power source > is not yet connected, y is equal to 5.0 cm. The voltage source will > now be connected, so that the spring will be stretched further and a > Lorentz force will be exerted. The current in the coil can be changed > by chaging the resistance. If there is a larger current, the spring > will stretch more. A.When calculating the LorentzForce : Fl=N*B*I*l Is the length (l) 8cm or 10cm? And why? B. If the value of the current intensity is at a certain value, the coil length does not appear to increase any further with an increase in the current intensity. Why is this the case when y=10 cm and how to apply the righthandrule in here? 2. Relevant equations Fl=N*B*I*l righthandrule 3. The attempt at a solution A. I don't know why it should be 8cm... I think 10cm, is because the height of the coil. But I don't see why it should be ten, because when there is no current y is already 5. And I don't see how you can use the righthandrule to show that the coil is going upward after y=10cm.