Two objects attract each other with a gravitational force of 50 newtons from a given distance. if the distance between the two objects is increased by 5 times, what will be the changed force of attraction between them? a. 2 newtons b. 10 newtons c. 125 newtons d. 625 newtons

The gravitational force between two objects varies inversely with the square of the distance between them.

So if the distance is multiplied by a factor of 5, the force is multiplied by a factor of (1/5²).

New force = (50 Newtons) x (1/5²)

New force = (50 / 5²) Newtons

New force = (50 / 25) Newtons

New force = 2 Newtons (A)

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.