a rod moves with a speed of 1.6m/s on a rails 30cm apart. the rod has a resistance of 2.5ohm and a magnetic field of 0.35T, and the resistance of the U-shaped conductor is 21.0ohm at a given instant. calculate the induced emf, current, and external force needed to keep the rod's velocity at a constant at that instant

insects!

explanation:

double the distance = divide strength by 4

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.