When tension of a string is increased by \( 2.5 \mathrm{~N} \), the...

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When tension of a string is increased by \( 2.5 \mathrm{~N} \), the initial frequency is altered in the ratio of \( 3: 2 \). The initial tension in the string is
\( \mathrm{P} \)
(a) \( 6 \mathrm{~N} \)
(b) \( 5 \mathrm{~N} \)
(c) \( 4 \mathrm{~N} \)
(d) \( 2 \mathrm{~N} \)
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