Physics - Magnetism Question with Solution | TestHub

PhysicsMagnetismBiot-savart's & Ampere's Circuital lawMedium2 minPYQ_2024

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A long straight wire of radius a carries a steady current 1 . The current is uniformly distributed across its cross section. The ratio of the magnetic field at $\frac{a}{2}$ and 2a from axis of the wire is:

Options:

Answer:

Solution:

Magnetic field due to straight wire, $B = \frac{μ _{0} I}{2 π r}$ Magnetic field at $\frac{a}{2}$ is, $B_{a /2} = \frac{μ _{0} I}{2 π ( a /2 )}$ $∴ \frac{B _{a /2}}{B _{2 a}} = \frac{1}{1} = 1 : 1$

Stream:BITSATSubject:PhysicsTopic:MagnetismSubtopic:Biot-savart's & Ampere's Circuital law

⏱ 2mℹ️ Source: PYQ_2024

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