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(a) Draw graph showing the variation of ...

(a) Draw graph showing the variation of current versus voltage in an electroyte when an external resistance is also connceted.
(b) (i) The graph between resistance (R ) and temperature (T) for Hg is shown in the figure (a). Explain the behaviour of Hg near 4k.
(ii) In which region of the graph shown in the figure (b) is the resistance negative and why?

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(a) Current

(i) Near 4 K the resistance of Hg is zero hence it will at like a super conductor.
(i) From B to C, the resistance is -ve, as voltage is increasing and the current is decreasing.
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XII BOARDS PREVIOUS YEAR-XII BOARDS-SECTION - C
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