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Q.

A battery is connected to a uniform resistance wire AB and B is earthed. Which one of the graphs below shows how the current density J varies along AB

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a

b

c

d

answer is D.

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Detailed Solution

Wire AB is uniform so current through wire AB at every across section will be same. Hence current density  J=i/A at every point of the wire will be same
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A battery is connected to a uniform resistance wire AB and B is earthed. Which one of the graphs below shows how the current density J varies along AB