Verified Solution • 2025–26 Session moderate

QNEET-2022-Ph-456: NEET 2022 Physics - Class 12 NEET-2022-Ph-456 Solution: A copper wire of length 10 m and radius \(( {10^{-2}}{ { }})\…

A copper wire of length 10 m and radius (10−2π) m(\frac{10^{-2}}{\sqrt{\pi}})\ \text{m} has electrical resistance of 10Ω10\Omega. The current density in the wire for an electric field strength of 10 (V/m) is 104 A/m210^4\ \text{A/m}^2 106 A/m210^6\ \text{A/m}^2 10−5 A/m210^{-5}\ \text{A/m}^2 105 A/m210^5\ \text{A/m}^2

Multiple Choice Options

  • A 10 4 A/m 2
  • B 10 6 A/m 2
  • C 10 −- _ 5 A/m 2
  • D 10 5 A/m 2

Step-by-Step Verified Solution

Resistance, R = _ L A = L _ A _ _ = L R A Also current density j = _ E = L E R A J = 10 _ 10 10 _ � ( 10 _ 2 � ) 2 = 100 10 _ � _ ( 10 _ 4 � ) = 10 5 A/m 2

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