A solid metal cylinder has a certain resistance. It is then heated and carefully stretched to form a longer, thinner cylinder. After it cools, will its resistance be the same as, greater than, or less than what it was before

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge

according to jean piaget, in what stage of cognitive development are children able to understand conservation task?

b. preoperational

just took it

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.