Three equal charges are placed at the corner of equilateral triangle ABC of side 10 cm calculate the electric potential due to these charges at midpoint of AB

their crystal patterns have been disrupted by stress

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement

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.