A parallel plate air condenser has a capacity ‘C’. When the plate separation is halved and a dielectric of constant k is inserted, new capacitance is found to be 12C. The value of dielectric constant ‘k’ is?
A
12
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B
24
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C
6
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D
3
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Solution
The correct option is C 6 C=ϵ0Ad;C1=kϵ0A(d2) C1C=2k; 12=2k;k=122=6