A) 5
B) 1.25
C) 4
D) 2.5
Correct Answer: A
Solution :
[a] : Here, t = 2 mm, x = 1.6 mm, K = ? As potential difference remains the same, capacity must remain the same \[\therefore \]\[\frac{{{\varepsilon }_{0}}A}{d-t+\frac{t}{k}}=\frac{{{\varepsilon }_{0}}A}{d-1.6}\]where d is the separation between the plates initially. \[x=t\left( 1-\frac{1}{K} \right)\Rightarrow 1.6=2\left( 1-\frac{1}{K} \right)\]which gives K=5.You need to login to perform this action.
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