The breaking stress of wire going over a smooth pully is $2 \times 10^9\, N/m^2$. What would be the minimum radius of wire used if it is not to break?
  • A$0.46 \times {10^{ - 6}}\,m$
  • B$0.46 \times {10^{ - 4}}\,m$
  • C$0.46 \times {10^{ 8}}\,m$
  • D$0.46 \times {10^{ - 11}}\,m$
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