Two identical capacitors store different amounts of energy: capacitor A stores 2.0 x 10-3 J, and capacitor B stores 1.8 x 10-4 J. The voltage across the plates of capacitor B is 12 V. Find the voltage across the plates of capacitor A.

39.9 V

Explanation:

Given that

Capacitor are indentical that is why the value of C will be same for both the capacitor.

We know that energy stored in the capacitor is given as

V=Voltage

C=Capacitance

For A :

E₁= 2 x 10⁻³ J

Voltage = V₁

For B :

E₂=1.8 x 10⁻⁴ J

V₂ = 12 V

Now by using above two equation

Therefore the voltage on capacitor A will be 39.9 V

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