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5.Magnetism and Matter
hard
The ratio of magnetic moments of two bar magnet is $13 : 5$. These magnets are held together in a vibration magnetometer are allowed to oscillate in earth’s magnetic field with like poles together $15$ oscillation per minute are made. What will be the frequency of oscillation of system if unlike poles are together....$oscillations/min$
A
$10$
B
$15$
C
$12$
D
$\frac{{75}}{{13}}$
Solution
(a) $\frac{{{M_1}}}{{{M_2}}} = \frac{{\nu _s^2 + \nu _d^2}}{{\nu _s^2 – \nu _d^2}}$ $==>$ $\frac{{13}}{5} = \frac{{{{(15)}^2} + \nu _d^2}}{{{{(15)}^2} – \nu _d^2}}$
$==>$ ${\nu _d} = 10$ $oscillations/min$
Standard 12
Physics
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