A company that makes electric doorbells has been making electromagnets by wrapping copper wire around steel bolts. When current passes through the coil of copper wire, the steel bolt becomes magnetic. The electromagnet then attracts a clapper that rings the bell. But a new employee has used copper bolts as cores for some electromagnets. These copper-bolt electromagnets don't become very magnetic when current passes through their coils because
A)	unlike the atoms in steel, the atoms in copper are not intrinsically magnetic.
B)	both the bolt and the coil around the bolt are made of copper so that no magnetic dipole can be created.
C)	copper is a better conductor of electrical current than steel so that the copper bolt short-circuits the magnetic field.
D)	copper is not a metal and only metals can become magnetic.
Answer:A
A company that makes electric doorbells has been making electromagnets by wrapping copper wire around steel bolts. When current passes through the coil of copper wire, the steel bolt becomes magnetic. The electromagnet then attracts a clapper that rings the bell. But a new employee has used copper bolts as cores for some electromagnets. These copper-bolt electromagnets don't become very magnetic when current passes through their coils because
A)	unlike the atoms in steel, the atoms in copper are not intrinsically magnetic. B)	both the bolt and the coil around the bolt are made of copper so that no magnetic dipole can be created. C)	copper is a better conductor of electrical current than steel so that the copper bolt short-circuits the magnetic field. D)	copper is not a metal and only metals can become magnetic.