Physics Question from JEE Main 2026 · 23 January, Shift 2

A parallel plate capacitor with plate separation $5 \, \text{mm}$ is charged by a battery. On introducing a mica sheet of thickness $2 \, \text{mm}$ and maintaining the connections of the plates with the terminals of the battery, it is found that it draws $25\%$ more charge from the battery. The dielectric constant of mica is _____.