A toroid filled with a magnetic substance carries a steady current of 2.91 A. The coil contains 802 turns, has an average radius of 4.33 cm. The magnetic field through the toroid is 0.193137 T. Assume the flux density is constant. What is the magnetic field strength H within the core in the absence of the magnetic substance?

Amachinist needs to remove a tight fitting pin of material a from a hole in a block made of material b. the machinist heats both the pin and the block to the same high temperature and removes the pin easily. what statement relates the coefficient of thermal expansion of material a to that of material b? a) the situation is not possible, heating block b will shrink the hole in the material as the material expands with increasing temperatureb) material b has the same coefficient of expansion as does material ac) material b has a negative coefficient of expansion and a has a positive coefficient of expansiond) material a has a greater coefficient of expansion than does material be) material b has a greate

Asmall 21 kilogram canoe is floating downriver at a speed of 1 m/s. what is the canoe's kinetic energy?

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain