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A solid sphere made out of metal having a bulk modulus of `2xx10^(11)"Mn"^(-2)`is charged uniformly to a surface charge density `sigma=sqrt(alpha epsilon_(0))Cm^(-2)`, where `epsilon_(0)` is the permittivity of free space and `alpha` (magnitude = 1) is a positive constant of appropriate dimensions. If the volume strain produced in the sphere after charging is `x xx 10^(-11)` then the value of x is

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`0.25`
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