A transverse wave described by equation \( y=0.02 \) \( \mathrm{P} ...

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A transverse wave described by equation \( y=0.02 \)
\( \mathrm{P} \) \( \sin (x+30 t) \) (where \( x \) and \( t \) are in metres and sec.respectively) is travelling along a wire of area of cross-section \( 1 \mathrm{~mm}^{2} \) and
W density \( 8000 \mathrm{~kg} / \mathrm{m}^{3} \). What is the tension in the string ?
(A) \( 20 \mathrm{~N} \)
(B) \( 7.2 \mathrm{~N} \)
(C) \( 30 \mathrm{~N} \)
(D) \( 14.4 \mathrm{~N} \)
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