The strain energy stored in a body of volume $V$ due to shear strain $\phi$ is (shear modulus is $\eta$ )

  • A

    $\frac{\phi^2 V}{2 \eta}$

  • B

    $\frac{\phi V^2}{2 \eta}$

  • C

    $\frac{\phi^2 V}{\eta}$

  • D

    $\frac{1}{2} \eta \phi^2 V$

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