When a dielectric slab is gradually inse...

When a dielectric slab is gradually inserted between the plates of an isolated parallel-plate capacitor , the energy of the system decreases.What can you conclude about the force on the slab exerted by the electric field?

`eEV_0//m_e`

`eEL//m_e.V_0`

zero

`eEL//sqrt(m_eV_0)`

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