Verified Solution • 2025–26 Session moderate

QNEET-2023-Ph-364: NEET 2023 Physics - Class 12 NEET-2023-Ph-364 Solution: A certain wire A has resistance \(81 \). The resistance of…

A certain wire A has resistance 81Ω81\Omega. The resistance of another wire B of same material and equal length but of diameter thrice the diameter of A will be: 81Ω81\Omega 9Ω9\Omega 729Ω729\Omega 243Ω243\Omega

Multiple Choice Options

  • A 81 Ω81 ~\Omega 81   �
  • B 9 Ω9 ~\Omega 9   �
  • C 729 Ω729 ~\Omega 729   �
  • D 243 Ω243 ~\Omega 243   �

Step-by-Step Verified Solution

R = _ L A If diameter becomes thrice then cross section area will become 9 times so R _ 1 A Resistance will become 1 9 times R _ = 81 � 9 = 9 �

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