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Q.

When a dielectric slab of thickness 4 cm is introduced between the plates of parallel plate condenser, it is found the distance between the plates has to be increased by 3cm to restore to capacity to original value. The dielectric constant of the slab is

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a

1/4

b

4

c

3

d

1

answer is B.

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Detailed Solution

C=∈0Ad−t(1−1/k)=∈0Ad−d′
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