Answer:
The ratio of the new potential energy to the potential energy before the insertion of the dielectric is 0.58
Step-by-step explanation:
Given that,
Length of plates = 8 cm
Width = 5.52 cm
Distance = 1.99 cm
Dielectric constant = 2.6
Length = 4.4 cm
Potential = 0.8 V
We need to calculate the initial capacitance
Using formula of capacitance

Put the value into the formula


We need to calculate the final capacitance
Using formula of capacitance

Put the value into the formula


We need to calculate the ratio of the new potential energy to the potential energy before the insertion of the dielectric
Using formula of energy

Put the value into the formula


Hence, The ratio of the new potential energy to the potential energy before the insertion of the dielectric is 0.58