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CUET · PHYSICS · PYQ PAPER 2025

A magnetic field B exists in a direction perpendicular to the plane of a square loop made of metal wire. The wire has a diameter of 4 mm and a total length of 30 cm. The magnetic field B changes at a steady rate of \( 0.032 \text{ T s}^{-1} \). The induced current in the closed loop is\n(Given: Resistivity of the metal wire is \( \rho = 1.57 \times 10^{-8} \Omega \text{ m} \))

  1. A 0.34 A
  2. B 0.48 A
  3. C 0.53 A
  4. D 0.61 A
Verified Solution

Answer & Solution

Correct Answer

(B) 0.48 A

Step-by-step Solution

Detailed explanation

\( s = \frac{L_{total}}{4} = \frac{0.30}{4} = 0.075 \text{ m} \) \( A_{loop} = s^2 = (0.075)^2 = 0.005625 \text{ m}^2 \) \( A_{wire} = \pi \left(\frac{d}{2}\right)^2 = \pi \left(\frac{4 \times 10^{-3}}{2}\right)^2 = \pi (2 \times 10^{-3})^2 = 1.2566 \times 10^{-5} \text{ m}^2 \)…
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