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A paralel plate capacitor having cross s...

A paralel plate capacitor having cross sectional area A and seperation d has air in between plates. Now an insulating slab of same area but thickness d/2 is inserted between plates having dielectric constant k =4. Ratio of new capacitance to its original capacitance will be

A

0.084027777777778

B

0.33680555555556

C

0.25347222222222

D

0.16736111111111

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The correct Answer is:
B
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