The radii of two spheres forming a spherical condenser are 0.12m and 0.9m. If a medium of electric constant is 6 is completely filled in between , the capacity of the condenser will be ?
240×10−10F
0.240×10−9F
0.24F
18F
A
0.240×10−9F
B
18F
C
240×10−10F
D
0.24F
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