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The cantilever beam of Length $L$ and Flexural modulus $EI$ is subjected to a point load $P$ at the free end. The elastic strain energy stored in the beam due to bending (neglecting transverse shear) is

  1. $\dfrac{P^{2}L^{3}}{6EI} \\$
  2. $\dfrac{P^{2}L^{3}}{3EI} \\$
  3. $\dfrac{PL^{3}}{3EI} \\$
  4. $\dfrac{PL^{3}}{6EI}$
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