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The plates of a parallel plate capacitor...

The plates of a parallel plate capacitor are separated by 1cm Two parallel sided dielectric slabs of thickness 0.6 cm and 0.4cm fill the space between the plates. The dielectric constants of the two slabs are 3 and 5 respectively and a potential difference of 210V is applied across the plates. Electric field in the slab of 0.6cm thick is `(k)/(2)times10^(4)V/m` .Find the value of k

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