An electric current can produce
$(a)$. heating effect
$(b)$. chemical effect
$(c)$. magnetic effect
$(d)$. chemical, heating and magnetic effects

An electric current can produce a chemical effect, heating effect, and magnetic effect. When a current is passed through a solution, the chemical reaction caused by an electric current is known as the chemical effect of an electric current.

When an electric current is passed in a filament, the temperature of the filament gets raised and heat is produced. This is called the heating effect of an electric current.

When an electric current is passed through a wire, then a magnetic field is produced around the wire which is said to be the magnetic effect of an electric current.

Therefore, option $(d)$ is correct.