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Q.

The separation between parallel plates of a capacitor is 6mm. when a dielectric slab of K=3 is introduced, capacitance increases by 40%, what is thickness of slab?

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a

3.2mm

b

2.6mm

c

2.0mm

answer is D.

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Detailed Solution

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C=ε0AdC′=ε0Ad-t1−1k1.4ε0Ad=ε0Ad−t1−131.46=16−t238.4−1.423t=6,2.4=1.4×23tt=2.4×31.4×2=2.6mm

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