Question

A silver wire has a resistance of 4.2 ohm at 27 degree celcius and 5.4 ohm at 100 degree celcius.

Answer 1

Answer:

Hey mate plzz refer to the attachment

Answer 2

Answer:

0.00391

Explanation:

R2= R1 [ 1+α (T2-T1) ]

∴5.4 = 4.2 [ 1+α (100-27) ]

∴$\frac{5.4}{4.2}$ = 1 + 73α

∴$\frac{54}{42}$ - 1 = 73α

∴$\frac{54-42}{42}$ = 73α

∴$\frac{12}{42}$ = 73α

∴α = $\frac{12}{42 X 73}$

∴α = $\frac{2}{511}$

∴α = 0.00391  OR 3.91 x $10^{-3}$ / degree celsius