Express joule in terms of erg.
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1 joule = 1N × 1m
As we know, 1 N = 105 dyne and 1 m = 102 cm
Therefore,
1 joule = 105 dyne x 102 cm⇒ 1 joule = 107 dyne cmSo, 1 joule = 107 erg.
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