Physics · 2024
JEE Main · 8 April 2024, Shift 2 · Q42
A long straight wire of radius a carries a steady current I. The current is uniformly distributed across its cross section. The ratio of the magnetic…
A long straight wire of radius a carries a steady current I. The current is uniformly distributed across its cross section. The ratio of the magnetic field at $\displaystyle \frac{\mathrm{a}}{2}$ and $\displaystyle 2$ a from axis of the wire is :
Official answer
From NTA’s final answer key for this paper.
(3)
$\displaystyle 1$ : $\displaystyle 1$
More from Magnetic Field and Forces
- An electron is projected with uniform velocity along the axis inside a current carrying long solenoid. Then:2024
- An electron moves through a uniform magnetic field B=B_0 i+2 B_0 j T. At a particular instant of time, the velocity of electron is u=3 i+5 j m / s.…2024
- A uniform magnetic field of 2 × 10^-3 T acts along positive Y -direction. A rectangular loop of sides 20 cm and 10 cm with current of 5 A is in Y-Z…2024
- An infinitely long straight wire carrying current I is bent in a planer shape as shown in the diagram. The radius of the circular part is r. The…2026
- Two parallel long current carrying wire separated by a distance 2 r are shown in the figure. The ratio of magnetic field at A to the magnetic field…2024
- A proton is moving undeflected in a region of crossed electric and magnetic fields at a constant speed of 2 × 10^5 ms^-1. When the electric field is…2025
- The horizontal component of earth's magnetic field at a place is 3.5 × 10^-5 T. A very long straight conductor carrying current of √2 A in the…2024
- An infinite wire has a circular bend of radius a, and carrying a current I as shown in figure. The magnitude of magnetic field at the origin O of the…2025
JEE Main 2024 Physics question, with the answer from NTA’s final answer key. Where our answers come from.