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A transverse wave described by an equation
\( \mathrm{P} \) \( \mathrm{y}=0.02 \sin (\mathrm{x}+30 t) \), where \( x \) and \( t \) are in metre and second, is travelling along a wire of area of
W cross-section \( 1 \mathrm{~mm}^{2} \) and density \( 8000 \mathrm{kgm}^{-3} \). What is the tension in the string?
(1) \( 20 \mathrm{~N} \)
(2) \( 7.2 \mathrm{~N} \)
(3) \( 30 \mathrm{~N} \)
(4) \( 14.4 \mathrm{~N} \)
\( \theta \)
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