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A 4 nF air capacitor is connected to power supply, the energy stored in the capacitor...

A 4 nF air capacitor is connected to power supply, the energy stored in the capacitor is 72x10-5 J. While capacitor is kept connected to the power supply, a slab of dielectric şs inserted that completely fills the space between the plates. The increases the stored energy by 288x10-6J.

What is the dielectric constant of slab?

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