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Current Electricity
Question
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The given graph shows the variation of resistance of mercury in the temperature range 0 < T < 4 kelvin. Name the phenomenon shown by the graph. 

Answer

Here, in the given graph the resistance drops abruptly as the temperature is lowered, which is a characteristic trait exhibited by superconductors.
Therefore, the phenomenon of superconductivity is shown by the graph.

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Some More Questions From Current Electricity Chapter

What conclusion can you draw from the following observations on a resistor made of alloy manganin?

Current A

Voltage V

Current A

Voltage V

0.2

0.4

0.6

0.8

1.0

2.0

3.94

7.87

11.8

15.7

19.7

39.4

3.0

4.0

5.0

6.0

7.0

8.0

59.2

78.8

98.6

118.5

138.2

158.0

Answer the following questions:
A steady current flows in a metallic conductor of non-uniform cross-section. Which of these quantities is constant along the conductor: current, current density, electric field, drift speed?

Answer the following questions:
Is Ohm’s law universally applicable for all conducting elements? If not, give examples of elements which do not obey Ohm’s law.