Two 3.00 cm x 3.00 cm plates that form a parallel-plate capacitor are charged to plus and minus 0.708 nC

Two 3.00 cm x 3.00 cm plates that form a parallel-plate capacitor are charged to plus and minus 0.708 nC .
Part A) What is the electric field strength inside the capacitor if the spacing between the plates is 1.00 mm?
Part B) What is potential difference across the capacitor if the spacing between the plates is 1.00 mm?