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valkas [14]
3 years ago
12

At 20 ◦C a copper wire has a resistance of 4×10−3 Ω and a temperature coefficient of resistivity of 3.9×10−3 (C◦)−1, its resista

nce at 100 ◦C is
A.
52.5 × 10-3 Ω
B.
5.25 × 10-3 Ω
C.
5.25 × 10-4 Ω
D.
5.25 × 10-2 Ω


E.
25.5 × 10-3 Ω
Physics
1 answer:
Nataly_w [17]3 years ago
4 0

Answer:

R _{t} = R _{0}( \alpha t + 1) \\  = 4 \times  {10}^{ - 3} (3.9 \times  {10}^{ - 3}  \times 20 + 1) \\  = 4 \times  {10}^{ - 3} (1.078) \\  = 4.312 \times  {10}^{ - 3}   \:  Ω

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