Assuming that voltage remains constant, what happens to the current in a wire as its diameter increases?
A. The current alternates between high and low values.
B. The current is not affected by a change in wire diameter.
C. The current increases.
O D. The current decreases.

so easy. just google the electromagnetic waves and it’ll pop up.

e/c, where e is its total energy

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray

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.