2. A stationary 0.325 kg steel ball begins rolling down a frictionless track from a height has shown in the diagram. It completes a loop-the-loop of radius 1.20 m with a speed of 6.00 m/s at the top of the loop. What is the gravitational
potential energy of the ball
at the top of the loop?

A. 0.98 J
B. 3.82 J
C. 5.85 J
D. 0 7.65 J

their crystal patterns have been disrupted by stress

snell's law

refractve index = sin incidence / sin refraction

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.