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Physics - Magnetism Question with Solution | TestHub

PhysicsMagnetismMagnetic torque & energyEasy2 minPYQ_2020

PhysicsEasysingle choice

A thin flexible wire of length $L$ is connected to two adjacent fixed points and carries a current $I$ in the clockwise direction, as shown in the figure. When the system is put in a uniform magnetic field of strength $B$ going into the plane of the paper, the wire takes the shape of a circle. The tension in the wire is

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Answer:

Solution:

$L = 2 πR$

$∴ R = \frac{L}{2 π}$

$2 Tsin (dθ) = F_{m}$

For small angles, $\sin (dθ) \approx dθ$

$∴ 2 T (dθ) = I (dL) Bsin 90 °$

$= I (2 R . dθ) . B$

$∴ T = IRB = \frac{ILB}{2 π}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:MagnetismSubtopic:Magnetic torque & energy

⏱ 2mℹ️ Source: PYQ_2020

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