Physics - Magnetism Question with Solution | TestHub

PhysicsMagnetismMagnetic Dipole & MomentEasy2 minPYQ_2020

PhysicsEasysingle choice

A rigid circular loop of radius $r$ and mass $m$ lies in the $x - y$ plane of a flat table and has a current $i$ flowing in it. At this particular place, the Earth's magnetic field is $\vec{B} = B_{x} \hat{i} + B_{z} \hat{k}$ . The value of $i$ , so that the loop starts tilting, is

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Answer:

Solution:

$\vec{M} = i (π r^{2}) \hat{k}$ ,

$\vec{B} = B_{x} \hat{i} + B_{z} \hat{k}$

To start tilting

$τ_{d u e t o m a s s} = τ_{m a g n e t i c}$

$|(m g) r| = |\vec{M} \times \vec{B}|$

$(m g) (r) = i (π r^{2}) (B_{x})$

$i = \frac{m g}{π r B_{x}}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:MagnetismSubtopic:Magnetic Dipole & Moment

⏱ 2mℹ️ Source: PYQ_2020

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