Final answer:
Electric currents cause the needle of a compass to point due to magnetic field induction.
Step-by-step explanation:
The electric currents cause the needle of a compass to point due to magnetic field induction. The charges in the electric current produce a magnetic field, and this magnetic field interacts with the magnetic field of the compass needle, causing the needle to deflect. The interaction between the two magnetic fields is what causes the needle of the compass to point in a certain direction.