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Column I has some conductor across which battery is connected as shown. Variation of Resistivity $ρ$ is also indicated. Which of the quantities in column II remain constant throughout the volume of conductor.
Column–I Column–II
A
P Magnitude of electric field
B
Q Magnitude of current density
C
R Power dissipated per unit volume
D
S Drift speed of free electron
T Electric current

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$A - Q S T, B - Q S T, C - P T, D - T$

$A - Q T, B - T, C - P T, D - T$

$A - Q S T, B - T, C - P T, D - Q S T$

$A - Q S T, B - Q S T, C - T, D - P T$

answer is B.

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Detailed Solution

i = neAvd. i has to be constant
$∵$ A remains constant
$∴$ j should remain constant

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