A) 4 : 9
B) 9 : 4
C) 2 : 3
D) 3 : 2
Correct Answer: A
Solution :
[a] \[{{T}_{1}}=\frac{60}{10}=6s\] and \[{{T}_{2}}=\frac{60}{15}=4s\] For identical magnets, \[\frac{{{M}_{1}}}{{{M}_{2}}}=\frac{T_{2}^{2}}{T_{1}^{2}}=\frac{{{4}^{2}}}{{{6}^{2}}}=\frac{16}{36}=\frac{4}{9}.\]
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