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Using dimensional analysis, convert one ...

Using dimensional analysis, convert one joule into erg.

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Dimension of `b =[L^2]`
Now `a= b-x^2/Et`
Dimension of` a= L^2/[ML^2T^2][T]`
`[M^-1T]`
Dimension of ab =`M^-1 L^2T`
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