14. A copper wire whose resistivity is 0.0043/°C at 0°C has its resistance increases by 25% of its initial value at 20°C. What is the operating temperature? А. 56.8 °C В. 83.1 °С C. 52.5 °C D. 78.3°C...

Extracted text: 14. A copper wire whose resistivity is 0.0043/°C at 0°C has its resistance increases by 25% of its initial value at 20°C. What is the operating temperature? А. 56.8 °C В. 83.1 °С C. 52.5 °C D. 78.3°C 15. Two resistors R, and R, are connected in parallel. R1 is twice of R2 . If the current in R, is I, what is the current in R2? А. I В. 21 С. 41 D. I/2