an ideal gas occupies 400m3 at a pressure of 250 pa. if the volume is changed to 100m3 at constant temperature, what will be the new pressure of the gas​

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle

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.