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a is correct because according to on floor we know that resistance is inversely proportional to current so if we increase the current then resistance will also increase and decrease the current then resistance will increase in the figure a is most tilted towards v and d is most tilted towards I so d have least conducting properties
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Explanation:
(i)A is the best conductor of electricity as its slope, i.e., resistance is the least.
(ii) A is the thickest, as for its low resistance, it must be thick....as, R∝1/A.
(iii) D is the longest, as for its high resistance, it must be long....as, R∝l.
(iv) (ii)Ra<Rb<Rc<Rd,.....as the resistance of A is the least and it gradually increases for B, C and D, which has the highest.
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