A chord attached about an end to a vibrating fork divides it into 6...

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A chord attached about an end to a vibrating fork divides it into 6 loops. When its \( t \) tension is \( 36 \mathrm{~N} \).
\( \mathrm{PW} \) The tension at which it will vibrate in 4 loops when attached to same tuning fork is
(1) \( 24 \mathrm{~N} \)
(2) \( 36 \mathrm{~N} \)
(3) \( 64 \mathrm{~N} \)
(4) \( 81 \mathrm{~N} \)
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