AP EAMCET · PHYSICS · Magnetic Effects of Current
Two bar magnets \(A\) and \(B\) are placed one over the other and are allowed to vibrate in a vibration magnetometer. They make 20 oscillations per minute when the similar poles of \(A\) and \(B\) are on the same side, while they make 15 oscillations per minute when their opposite poles lie on the same side. If \(M_A\) and \(M_B\) are the magnetic moments of \(A\) and \(B\) and if \(M_A>M_B\), the ratio of \(M_A\) and \(M_B\) is
- A \(4: 3\)
- B \(25:7\)
- C \(7:5\)
- D \(25:16\)
Answer & Solution
Correct Answer
(C) \(7:5\)
Step-by-step Solution
Detailed explanation
Ratio of magnetic moments of two magnets of equal size when in sum and difference position is \(\frac{M_A}{M_B}=\frac{T_d^2+T_s^2}{T_d^2-T_s^2}=\frac{v_s^2+v_d^2}{v_s^2-v_d^2}\)…
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