SATHEE: Current Electricity 1 Question 21

Current Electricity 1 Question 21

21. The current-voltage graphs for a given metallic wire at two different temperatures $T_{1}$ and $T_{2}$ are shown in the figure.

The temperature $T_{2}$ is greater than $T_{1}$

$(1985, 3 M)$

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Solution:

$\frac{I}{V} =$ slope of given graph $= \frac{1}{R}$ or $R = \frac{1}{slope}$

Resistance of a metallic wire increases with increase in temperature.

$\begin{aligned} (slope)_{T_{2}} & < (slope)_{T_{1}} \\ ∴ & \frac{1}{(slope)_{T_{2}}} & > \frac{1}{(slope)_{T_{1}}} \\ or R_{T_{2}} & > R_{T_{1}} or T_{2} > T_{1} \end{aligned}$

Current Electricity 1 Question 21

21. The current-voltage graphs for a given metallic wire at two different temperatures $T_{1}$ and $T_{2}$ are shown in the figure.

Solution:

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Current Electricity 1 Question 21

21. The current-voltage graphs for a given metallic wire at two different temperatures T1 and T2 are shown in the figure.

Solution:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

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21. The current-voltage graphs for a given metallic wire at two different temperatures $T_{1}$ and $T_{2}$ are shown in the figure.