Explain why the year 1800 was not a leap year, even though years divisible by four are normally considered to be leap years.

Answer and Explanation:

The year which is directly divided  by 400 will be a leap year and by 4 for example 2000 1600 are leap year because they are directly divided  by 400 and the year 1700 and 1800 although they are divided by 4 but not by 400 so they are not leap year,This is the reason even 1800 is divided by 4 but not a leap year

i would say

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.