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JEE Main 202524 JanuaryEvening Shift
Exam
JEE Main
Year
2025
Date
24 January
Shift
Evening Shift
Subject
Physics
Chapter
Magnetic Effects of Current

JEE Main 2025 · 24 January · Evening Shift · Physics · Magnetic Effects of Current

A long straight wire of a circular cross-section with radius ' a '...

A long straight wire of a circular cross-section with radius ' aa ' carries a steady current II. The current I is uniformly distributed across this cross-section. The plot of magnitude of magnetic field B with distance rr from the centre of the wire is given byA long straight wire of a circular cross-section with radius ' a ' carries a steady current I . The current I isA long straight wire of a circular cross-section with radius ' a ' carries a steady current I . The current I isA long straight wire of a circular cross-section with radius ' a ' carries a steady current I . The current I isA long straight wire of a circular cross-section with radius ' a ' carries a steady current I . The current I isA long straight wire of a circular cross-section with radius ' a ' carries a steady current I . The current I is

Options

  1. AA small circular loop of area A and resistance R is fixed on a horizontal xy -plane with the center of the loop always
  2. BA small circular loop of area A and resistance R is fixed on a horizontal xy -plane with the center of the loop always
  3. CA small circular loop of area A and resistance R is fixed on a horizontal xy -plane with the center of the loop always
  4. DA small circular loop of area A and resistance R is fixed on a horizontal xy -plane with the center of the loop always

Correct answer

D. A small circular loop of area A and resistance R is fixed on a horizontal xy -plane with the center of the loop always

Step-by-step solution

We know inside the wire $\begin{array}{ll} B=\frac{\mu_0 I}{2 \pi R^2} \cdot r & (O < r < R) \\ \text{ And } B=\frac{\mu_0 I}{2 \pi r} & \text{ for }(R < r) \end{array}A long straight wire of a circular cross-section with radius ' a ' carries a steady current I . The current I is
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