| List $I$ | List $II$ |
|---|---|
| $(A)$ Fleming's left hand rule | $(i)$ Direction of induced current |
| $(B)$ Right hand thumb rule | (ii) Magnitude and direction of magnetic induction |
| $(C)$ Biot-Savart law | (iii) Direction of force due to magnetic induction |
| $(D)$ Fleming's right hand rule | (iv) Direction of magnetic lines due to current |
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For the electrochemical cell, $Mg ( s )\left| Mg ^{2+}( aq , 1 M ) \| Cu ^{2+}( aq , 1 M )\right| Cu ( s )$ the standard emf of the cell is $2.70 V$ at $300 K$. When the concentration of $Mg ^{2+}$ is changed to $x M$, the cell potential changes to $2.67 V$ at $300 K$. The value of $x$ is.
(given, $\frac{ F }{ R }=11500 K V ^{-1}$, where $F$ is the Faraday constant and $R$ is the gas constant, The value of $\ln (10)=2.30$ )
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