1. a standard issue service pistol is the beretta m9. it fires a 9 mm diameter round that has a mass of 8 gr. the standard muzzle velocity is 360 m/s. the barrel is 12.7 cm long.
a. how long does the bullet take to travel through the barrel after it is fired?
(hint: v in t = d/v, is the average v of the bullet in the barrel.

i think the answer is a and b

i wish you luck

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.