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Q.

Two ends of a conductor of variable cross section are connected to the terminals of a battery. EC and ED are intensity of electric field at sections C and D respectively. Then

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a

EC = ED

b

EC > ED

c

EC < ED

d

Sufficient informations are not given to compare EC with ED

answer is B.

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Detailed Solution

If j be the current density, then JC > JD also, resistivity ρ=Ej⇒E=ρj.Since ρ is the same at all sections, we can conclude that EC > ED.
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