COMEDK · Physics · 20. Magnetic Properties of Matter
On both sides of a magnetic needle, two short magnets A and B are placed on the same horizontal line which is perpendicular to the magnetic meridian. The south poles of A and B are facing each other, which are 10 cm and 20 cm respectively from the magnetic needle. If the needle remains undeflected, the ratio of the magnetic moment of A to that B is:
- A \(2:1\)
- B \(1:2\)
- C \(8:1\)
- D \(1:8\)
Answer & Solution
Correct Answer
(D) \(1:8\)
Step-by-step Solution
Detailed explanation
The magnetic field due to a short magnet on its axial line at a distance \(d\) is given by \(B = \dfrac{\mu_0}{4\pi} \dfrac{2M}{d^3}\). Since the magnetic needle remains undeflected, the magnetic fields produced by magnets A and B at the position of the needle must be equal and…
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