Physics - Magnetism Question with Solution | TestHub

PhysicsMagnetismMagnetic Dipole & MomentEasy2 minPYQ_2020

PhysicsEasysingle choice

Two circular concentric loops of radii $r_{1} = 20 cm$ , $r_{2} = 30 cm$ are placed in the $X - Y$ plane as shown in the figure. A current $I = 7 A$ is flowing through them. The magnetic moment of this loop system is

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Answer:

Solution:

Here, magnetic moment due to loop $1$

$M_{1} = {iA}_{1}$

$= {iπr}_{1}^{2}$

$= 7 π {(0 .20)}^{2} = 0 .28 π$

Similarly magnetic moment due to loop- $2$

$M_{2} = {iA}_{2} = {iπr}_{2}^{2}$

$= 7 π {(0 .30)}^{2} = 0 .63 π$

Net magnetic moment

$= M_{1} - M_{2}$

$= 0 .63 π - 0 .28 π = 1 .1 A m^{2}$

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

⏱ 2mℹ️ Source: PYQ_2020

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