Question

The unit of charge is coulomb in SI system and esu of charge (or stat coul) in C.G.S. system 1 coloumb equals

• A. 3 $\times$ ${10}^9$ esu
• B. (1/3 $\times$ ${10}^9$) esu
• C. (1/3 $\times$ ${10}^8$)esu
• D. (9 $\times$ ${10}^9$ )esu

Answer 1

The correct option is A 3 $\times$ ${10}^9$ esu

Unit of charge:-
$I=\frac{q}{t}$
$q=It$
Unit of $q=A-sec$
Dimension = $\left[A^1{T}^1\right]$
S.I unit of charge is coulomb
C.G.S unit of charge = esu
$1C=3\times {10}^{9}esu$
$1emu=3\times {10}^{9}esu$
$1emu=10$ coulomb
$\frac{1emu}{1esu}=3\times {10}^{10}cm/s=3\times {10}^{9}esu$