Question

If a current­-carrying wire has a cross­-sectional area that gradually becomes smaller along the length of the wire, the drift velocity:________
a. increases along the length of the wire if the resistance increases too
b. decreases along the length of the wire if the resistance decreases too
c. decreases along the length of the wire
d. increases along the length of the wire
e. remains the same along the length of the wire

Answer 1

Answer:d

Explanation:

Drift velocity is given by

$v_d=\frac{I}{n\times Q\times A}$

where $v_d$=drift velocity

I=Current

n=no of electron

Q=charge of Electron

A=cross-section

If area of cross-section decreases gradually then drift velocity will increase because drift velocity is inversely proportional to Area of cross-section