Question

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 `3 cm` to restore to capacity to original value. The dielectric constant of the slab is.
A. 1//4
B. 4
C. 3
D. 1

Answer 1

Correct Answer - B
`C=(in_(0)A)/(d-t(1-1//k))=(in_(0)A)/(d-d)`.