If $\phi$ denotes reduction potential, then which is true ?

If $\phi$ denotes reduction potential, then which is true ?
  1. $E_{\text {cell }}^0=\phi_{\text {right }}-\phi_{\text {left }}$
  2. $\mathrm{E}_{\text {cell }}^0=\phi_{\text {left }}+\phi_{\text {right }}$
  3. $\mathrm{E}_{\text {cell }}^0=\phi_{\text {left }}-\phi_{\text {right }}$
  4. $\mathrm{E}_{\text {cell }}^0=-\left(\phi_{\text {left }}+\phi_{\text {right }}\right)$

Solution

$E_{\text {cell }}=E_{\text {right (cathode) }}-E_{\text {left (anode) }}$

Asked in: JEE Main 2002

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