Determine the power dissipated when a current of 5mA flows through an appliance having a resistance of 16KΩ.

i would think it's food chain

a skateboard rolling across the street - apex

this would be about 43%

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.