If the capacity of a spherical conductor is $1$ picofarad, then its diameter, would be
  • A$1.8 \times {10^{ - 3}}\,m$
  • B$18 \times {10^{ - 3}}\,m$
  • C$1.8 \times {10^{ - 5}}\,m$
  • D$18 \times {10^{ - 7}}\,m$
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