A wire has a non-uniform cross-section as shown in figure. A steady current flows through it. The drift speed of electrons at point P and Q is vP and vQ.
Why This Question? If current is constant then as area of conductor increases then drift velocity decreases. Current density can be represented by a similar set of lines known as streamlines. The spacing of the streamlines suggests the value of current density. Narrower streamlines mean more current density, spaced streamlines mean less current density |