Question

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​

Answer 1

Answer:

Explanation:

we know formula ,

i = neaved

where n is number of electrons per unit volume , e is the charge of an electron , a is the cross section area of wire , i is current through wire and vd is the drift speed of electrons .

e.g.,

therefore drift speed is inversely proportional to cross section area. e.g., if we increase the cross section area , drift speed will decrease.

here, from A to B cross section area increases.

hence, drift speed decreases from A to B.

Hence, decreases is correct.

Note : Please try to post full question.But I have attached this question picture Have A look please

Answer 2

Answer:

Explanation:

drift velocity proportional to 1/area of Cross section..

ie,larger the area slower will be the speed of electron...

therefore; Vp > Vq

Ans:C