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Home  >>  JEEMAIN and AIPMT  >>  Physics  >>  Class12  >>  Current Electricity
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At what temperature would the temperature of a copper conductor be double its value at $0^{\circ}C\: \alpha_{Cu} = 4 \times 10^{-3}$

$\begin {array} {1 1} (A)\;250^{\circ}C & \quad (B)\;200^{\circ}C \\ (C)\;150^{\circ}C & \quad (D)\;100^{\circ}C \end {array}$


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$R = R_0(1 + \alpha \Delta \theta )$
Substitute $R = 2R_0$ to get the final answer
Ans : (A)
answered Feb 14, 2014 by thanvigandhi_1
edited Mar 14, 2014 by thanvigandhi_1

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