Physics - Magnetism Question with Solution | TestHub

PhysicsMagnetismMagnetic torque & energyHard2 minPYQ_2020

PhysicsHardsingle choice

A square coil of edge $I$ having n turns carries a current $i$ . It is kept on a smooth horizontal plate. A uniform magnetic field $B$ exists in a direction parallel to an edge. The total mass of the coil is $m$ . The minimum value of $B$ for which the coil will start tipping over

Options:

Answer:

Solution:

Deflecting torque $= n i A B s i n 90$

$= n i l^{2} B$

Restoring torque $= m g \frac{l}{2}$

For tipping $n i l^{2} B \geq \frac{m g l}{2}$

$\Rightarrow B \geq \frac{m g}{2 n i l}$

$∴ B_{m i n} = \frac{m g}{2 n i l}$

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

⏱ 2mℹ️ Source: PYQ_2020

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