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A parallel plate capacitor is filled wit...

A parallel plate capacitor is filled with a dielectric having variable permittivity which depends on voltage of capacitor as `K=alpha v` and `alpha=2v^(-1)`
Another capacitor of same dimensions and with air between plates is charged to 78 V. If both capacitors are now joined, then the common potential of spheres is

A

2 v

B

3 v

C

5 v

D

6 v

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The correct Answer is:
A
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