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A parallel plate capacitor, partially filled with a dielectric slab of dielectric constant $K$ , is connected with a cell of emf $V\ volt$ , as shown in the figure. Separation between the plates is $D$ . Then
  • Aelectric field at point $P$ is less than that at point $P'$ .
  • Belectric field at point $P'$ is less than that at point $P$ .
  • Celectric fields at points $P$ and $P'$ are equal
  • Delectric field at point $P$ is $E = \frac{V}{{KD}}$ .
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