Question

At what temperature would the resistance of a copper wire will become three times its value at 0c

Answer 1

Hey Dear,

◆ Answer -

T = 781.9 K

◆ Explanation -

Variation of resistance with temperature is given by -

R = R0 (1 + α.∆T)

Given that R = 3R0,

3R0 = R0 (1 + 0.00393 × ∆T)

3R0 - R0 = R0 × 0.00393 × ∆T

∆T = 2 / 0.00393

∆T = 508.9 K

Now, temperature will be -

T = T0 + 508.9

T = 273 + 508.9

T = 781.9 K

Therefore, resistance of copper wire will become 3 times at 781.9 K.

Thanks dear...