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Physics - Magnetism Question with Solution | TestHub

PhysicsMagnetismMagnetic Dipole & MomentEasy2 minPYQ_2020

PhysicsEasysingle choice

The length of a magnet is large compared to its width and breadth. The time period of its oscillation in a vibration magnetometer is $2 s$ . The magnet is cut along its length into three equal parts are then placed on each other with their like poles together. The time period of this combination will be

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Answer:

Solution:

$T = 2 π \sqrt{\frac{I}{M B}} = 2$

Moment of inertia of each part $\frac{I}{27}$ and magnetic moment $= \frac{M}{3}$

$∴$ New M.I $I' = 3 \frac{I}{27} = \frac{I}{9}$

New magnetic moment $M' = 3 \frac{M}{3} = M$

$T' = 2 π \sqrt{\frac{\frac{I}{9}}{M B}} = \frac{1}{3} 2 π \sqrt{\frac{I}{M B}} = \frac{2}{3} s$

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

⏱ 2mℹ️ Source: PYQ_2020

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