Inductance of a coil is measured as $10 ~ \mathrm{mH}$, using an LCR meter, when no other objects are present near the coil. The LCR meter uses a sinusoidal excitation at $10 ~ \mathrm{kHz}$. If a pure copper sheet is brought near the coil, the same LCR meter will read ________.
- less than $10 ~ \mathrm{mH}$
- $10~ \mathrm{mH}$
- more than $10 ~\mathrm{mH}$
- less than $10~ \mathrm{mH}$ initially and then stabilizes to more than $10~ \mathrm{mH}$