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JEE Advanced 2020 Paper 1

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Each question has FOUR options. ONE OR MORE THAN ONE of these four option(s) is(are) correct answer(s).

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Question : 11

Total: 54

Shown in the figure is a semicircular metallic strip that has thickness t and resistivity ρ. Its inner radius is R1 and outer radius is R2. If a voltage V0 is applied between its two ends, a current I flows in it. In addition, it is observed that a transverse voltage ΔV develops between its inner and outer surfaces due to purely kinetic effects of moving electrons (ignore any role of the magnetic field due to the current). Then (figure is schematic and not drawn to scale)

I=
V0t
πρ
‌ln(
R2
R1
)
The outer surface is at a higher voltage than the inner surface
The outer surface is at a lower voltage than the inner surface
ΔV∝l2

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