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Question: If a slab of insulating material \(3.5 \times 10 ^ { - 5 } \mathrm {~m}\) to restore the capacity to...

If a slab of insulating material 3.5×10−5 m3.5 \times 10 ^ { - 5 } \mathrm {~m} to restore the capacity to original value. Then the dielectric constant of the material of slab is

A

10

B

12

C

6

D

8

Answer

8

Explanation

Solution

By using K=tt−d′K = \frac { t } { t - d ^ { \prime } }; here K=4×10−54×10−5−3.5×10−5K = \frac { 4 \times 10 ^ { - 5 } } { 4 \times 10 ^ { - 5 } - 3.5 \times 10 ^ { - 5 } }= 8