magic
It splits
your whole body will get cut in half
no. I am not sure what happens though.
You now have 2 bar magnets, each with half the magnetic force of the original.
The volume becomes one eighth.
the area of the original is 4 times the new value.
it is cut down by a factor of four since it is proportional to square of radius
You die, don't do it.
it is broken and somebody needs to fix it fast and it is also cut in half
The density of the solid substance remains unchanged when it is cut in half. The mass and volume are both halved, which means the ratio of mass to volume, i.e., density, stays the same.
You may think that it will be twoseparatenorth and south poles, but the magnetic field is changing the ways, so when you do cut it in half, it will become twoseparatemagnets, each with twonorthand south poles.
A tapeworm in a dog is called the same thing, a tapeworm. The most common kind of tapeworm found in dogs is the Dipylidium Caninum, which is the cucumber tapeworm or double-pore tapeworm.