Two short magnets with their axes horizontal and perpendicular to the magnetic meridian are plac...

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Two short magnets with their axes horizontal and perpendicular to the magnetic meridian are placed with their centres \( 40 \mathrm{~cm} \) east and \( 50 \mathrm{~cm} \) west of magnetic meridian. If the needle remains undeflected, the ratio of their magnetic moments \( M_{1}: M_{2} \) is
(A) \( 4: 5 \)
(B) \( 64: 125 \)
(C) \( 16: 25 \)
(D) \( 2: \sqrt{5} \)
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