The capacity of a parallel plate capacitor is 10µF, when . . .

Question : The capacity of a parallel plate capacitor is 10µF, when distance between the plates is reduced to 4 cm, the new capacity of the parallel plate capacitor will be 
a) 5 µF

b) 10 µF

c) 20 µF

d) 40 µF

Doubt by Angad

Solution :

Question is not incomplete or not correct.