Verified Solution • 2025–26 Session moderate

QNEET-2023-Ph-242: NEET 2023 Physics - Class 12 NEET-2023-Ph-242 Solution: The resistance of platinum wire at \(0^ C\) is \(2 \) and \(6.8 …

The resistance of platinum wire at 0∘C0^\circ C is 2Ω2\Omega and 6.8Ω6.8\Omega at 80∘C80^\circ C. The temperature coefficient of resistance of the wire is: 3×10−3 ∘C−13 \times 10^{-3}\ ^\circ C^{-1} 3×10−2 ∘C−13 \times 10^{-2}\ ^\circ C^{-1} 3×10−10 ∘C−13 \times 10^{-10}\ ^\circ C^{-1} 3×10−4 ∘C−13 \times 10^{-4}\ ^\circ C^{-1}

Multiple Choice Options

  • A 3×10−3C−13 \times 10^{-3} \mathrm{C}^{-1} 3 _ 1 0 _ 3 C _ 1
  • B 3×10−2C−13 \times 10^{-2} \mathrm{C}^{-1} 3 _ 1 0 _ 2 C _ 1
  • C 3×10−10C−13 \times 10^{-10} \mathrm{C}^{-1} 3 _ 1 0 _ 10 C _ 1
  • D 3×10−4C−13 \times 10^{-4} \mathrm{C}^{-1} 3 _ 1 0 _ 4 C _ 1

Step-by-Step Verified Solution

R T = R 0 [ 1 + _ ( T _ T 0 ) ] 6.8 = 2 [ 1 + _ ( 80 _ _ ) ] _ = 2.4 80 = 0.03 / _ C = 3 _ 10 _ 2 / _ C

Related Learning Resources & Exam Preparation

NEET PYQ Question Bank
Browse year-wise authentic previous years' questions with solutions
Authentic CBT Mock Tests
Simulate official exam environment with live timer and percentile scoring