Calculate the energy in a capacitor's electric field

[MisterP]

Homework Statement

Capacitor has a charge of 0.008C. Capacity is 2 μF. Need to calculate energy of electric field. Answer: 32J

Homework Equations

E = q²/2*C

The Attempt at a Solution

This seems right equation, but instead of 32J I get 16J.. any ideas?

 

[Master1022]

Homework Statement

Capacitor has a charge of 0.008C. Capacity is 2 μF. Need to calculate energy of electric field. Answer: 32J

Homework Equations

E = q²/2*C

The Attempt at a Solution

This seems right equation, but instead of 32J I get 16J.. any ideas?

I think you are correct and the stated answer is wrong. Unless I am missing some conceptual insight, I believe they have made a calculation error.