The standard weight and metre scales of the shops in the market are checked in every two years by the Department of Weights and Measures of Nepal, why?​

Nepal bureau of weight and measure, check correctness of the scales and weight used by the general public in the market in every two years because the measuring device may lose their standard due to the regular use and other factors which may bring error in the measurement. i hope it helps you.

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.