Question

The plates of a parallel plate capacitor are charged upto 200votts. A di-electric slab of thickness 4mm is inserted between the plates. Then to maintain the same potential difference between the plates of the capacitor, the distance between the plates is increased by 3.2mm. The di-electric constant of di-electric slab is 

1) 1 

2) 4 

3) 5 

4) 6 

Answer 1

Correct Option :3

Explanation :

C₀=∈₀ A/d after the dielectric slab of thickness ‘t’ is introduced