The figure shows a side view of a wire of varying circular c

The figure shows a side view of a wire of varying circular cross section. Rank in order the currents flowing in the three sections

Solution

C) I₁ = I₂ = I₃

Current in the three sections would be same because the resistances of the different parts are connected in series.The variation will occur in the voltage drop and the resistances(as they have different area of cross section) and they will adjust themselves to give a constant current.