A box is on someone's hand and it's mass is0.57kg if you push the box upward with a force of 8.4N what is the normal force acting on the box?

the device is called “ rocket engine”

seeing the graph would

k2s for potassium sulphide

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.