Q2.6Multiple choice
A parallel plate capacitor is made of two dielectric blocks in series. One of the blocks has thickness d1 and dielectric constant k1 and the other has thickness d2 and dielectric constant k2 as shown in d1 k1 Fig. 2.3. This arrangement can be thought as a dielectric slab of thickness d (= d1+d2) and effective dielectric constant k. The k is d1 k2 k1d1 k 2 d 2 k d k 2d 2 k k (d d 2 ) 2k1k 2 Fig. 2.3 (a) (b ) 1 1 (c ) 1 2 1 (d ) d1 d 2 k1 k 2 (k1d1 k 2 d 2 ) k1 k 2
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