Which is a unit of pressure? a. gram b. kilopascals c. newtons d. kilograms

B. Kilopascals.

A kilopascal equals to 1,000 pascals; and a pascal is equal to a force of 1 newton per square meter.

Meanwhile,

- a gram and a kilogram are both units of measurement for mass, and

- a newton is a unit of measurement for force.

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.