Question

question no 21 .....​

Answer 1

Factors on which resistance of conductor depends:

$r = p \frac{l}{a}$

p = constant

1) Resistance is directly proportional to length of the conductor.

2) Resistance is inversely proportional to area of cross section of the conductor.

3) Resistance also depends on temperature, resistance is directly proportional to temperature.

(I) Material A

(II) Material E

(III) If R1 is of A, R2 of D, p1 of A and p2 of D then,

$\frac{r1}{r2} = \frac{p1}{p2}$

$\frac{2}{r2} = \frac{1.6 \times {10}^{ - 8} }{96 \times {10}^{ - 8} }$

R2 = 96 ÷ 1.6

R2 = 120Ω