Question

The resistance of a copper wire at C 198 Q. If temperature coefficient of resistance of copper is 0.038 C-1 and when it is heated to 20'C then increase in resistance will be
a)500ohm
b)50ohm
c)200ohm
d)300 ohm​

Answer 1

Answer:

D) 300ohm

Explanation:

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Answer 2

Given:

Resistance = 198 Ω

Temperature coefficient of resistance = 0.038 /°C

Temperature raised = 20 °C

To find:

Increase in resistance

Solution:

$R_{t}$ = $R_{o}$ ( 1 + α ΔT)

    = 198 (1 + 0.038 × 20)

    = 350 ohm  

    ≈300 ohm