Question

Current is flowing through a wire of non-uniform
cross section. Cross section of wire A is less
than the cross section of wire at B.

Table 1	Table 2
(a) current at A	(p) is zero
(b) drift velocity of electrons at A	(q) is more than at B
(c) electric field in the wire at A	(r) is less than at B
(d) current density at A	(s) is equal to that at B

• A. a-p;b-q;c-q;d-p
• B. a - s, b - q, c - q, d - q
• C. a-q;b-r;c-p;d-q
• D. a-r;b-s;c-r;c-s

Answer 1

Answer: (B)

a - s, b - q, c - q, d - q

Current is independent of area of cross section.

$\Rightarrow$ Current at A - Current at B

$V_d\propto A^{-1}$

as $A_1<A_2\Rightarrow V_{dA}>V_{dB}$