Answer:
The maximum potential difference between two parallel conducting plates is 35400V
Step-by-step explanation:
The potential difference between two conductive plates is determined by the following formula:
V=E*d Equation (1)
Where,
V: The potential difference in volts (V)
E: The electric field in V/m
d : Distance between the plates (m)
Known data:

D=1.18cm, 1m=100cm, D=1.18cm*1m/100cm

We replace the information known in the equation (1):


V=35400V