20. Small block A sits on top of large block B, as shown in the diagram. Both blocks are being pulled to the right along a flat surface by a horizontal pull of 100 N. as shown in the figure. Both blocks are moving together at a constant velocity of 2.0 m/s to the right, and both have the same weight. Which free-body
diagram shows the horizontal forces acting on the upper block, A?

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b.b. at twice the distance, the magnitude of the field is 2b.c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.