1. Tardigrade
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  3. Physics
  4. Two short magnets with their axes horizontal and perpendicular to the magnetic meridian are placed with their centres 40 cm east and 50 cm west of magnetic meridian. If the needle remains undeflected, the ratio of their magnetic moments M1: M2 is

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Q. Two short magnets with their axes horizontal and perpendicular to the magnetic meridian are placed with their centres $40\, cm$ east and $50\, cm$ west of magnetic meridian. If the needle remains undeflected, the ratio of their magnetic moments $M_{1}: M_{2}$ is

Magnetism and Matter

Solution:

For null deflection, $\frac{M_{1}}{M_{2}}=\left(\frac{d_{1}}{d_{2}}\right)^{3}$
$=\left(\frac{40}{50}\right)^{3}=\frac{64}{125}$