Express joule in terms of erg. - Physics

Express joule in terms of erg.

Numerical

Relation between joule and erg :
1 joule = 1N × 1m
But 1N = 10⁵ dyne and 1m =100 cm = 10² cm
Hence, 1 joule = 10⁵ dyne × 10² cm
= 10⁷ dyne × cm

= 10⁷ erg

Thus, 1 Joule = 10⁷ erg.

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