In which direction does a bag at rest move when a force of 20 newtons is applied from the right?
a. in the direction of the applied force
b. in the direction opposite of the direction of the applied force
c. perpendicular to the direction of the applied force
d. in a circular motion

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.

a. spokes of a wheel.

as indicated in the question radial contains rad, also found in radius, so the fracture's would span the radius.