At room temperature, what is the strength of the electric field in a 12 gauge copper wire (diameter 2. 05 ) that is needed to cause a 4. 90 aa current to flow?.

co2reflects heat radiation back to earth buning coal and oil emits co2 globe warms

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.