Physics - Magnetism Question with Solution | TestHub

PhysicsMagnetismBiot-savart's & Ampere's Circuital lawEasy2 minPYQ_2020

PhysicsEasysingle choice

The strength of the magnetic field at a point $r$ near a long straight current-carrying wire is $B$ . The field at a distance $\frac{r}{2}$ will be

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Solution:

$B \propto \frac{1}{r} \Rightarrow \frac{B_{1}}{B_{2}} = \frac{r_{2}}{r_{1}} \Rightarrow \frac{B}{B_{2}} = \frac{\frac{r}{2}}{r} \Rightarrow B_{2} = 2 B$

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

⏱ 2mℹ️ Source: PYQ_2020

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