One joule is equal to how many erg?

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Solution

Conversion
Joule is the SI unit of energy and erg is the CGS unit of energy
$1$ Joule of energy $=$ $1$ Newton $\times$ $1$ meter
$1$ erg of energy $=$ $1$ dyne $\times$ $1$ cm
$1$ Joule of energy $=$ $10^{5}$ dyne $\times$ $10^{2}$ cm
$1$ Joule of energy $=$ $10^{7}$ erg
Hence $1$ Joule of energy is $10^{7}$ erg energy.

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