An air-filled parallel-plate capacitor is connected to a source of emf. The electric field has a strength of E E\,E between the plates. While the capacitor remains connected to the source of emf, the separation between the plates is halved.
What is the final electric field strength between the plates?
4E4E4E
2E2E2E
EEE
E2\frac{E}{2}2E
