$Mg|Mg^{2+}_{(aq)}||Ag^{+}_{(aq)}|Ag$ કોષ માટે સાચું નર્ન્સ્ટ સમીકરણ કયું છે $:$

• A
  $E_{\text{cell}} = E_{\text{cell}}^{o} - \frac{RT}{2F} \ln \frac{[Mg^{2+}]}{[Ag^{+}]^2}$
• B
  $E_{\text{cell}} = E_{\text{cell}}^{o} + \frac{RT}{2F} \ln \frac{[Ag^{+}]^2}{[Mg^{2+}]}$
• C
  $E_{\text{cell}} = E_{\text{cell}}^{o} - \frac{RT}{2F} \ln \frac{[Mg^{2+}]}{[Ag^{+}]}$
• D
  $E_{\text{cell}} = E_{\text{cell}}^{o} - \frac{RT}{2F} \ln \frac{[Ag^{+}]^2}{[Mg^{2+}]}$