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A spherical shell, made of material of electrical conductivity fraction numerator 10 to the power of 9 end exponent over denominator pi end fraction left parenthesis capital omega minus m right parenthesis to the power of negative 1 end exponent has + - thickness t = 2 mm and radius r = 10 cm. In an arrangement, its inside surface is kept at a lower potential than its outside surface The resistance offered by the shell is equal to
"

  1. 5 pi cross times 10 to the power of negative 12 end exponent capital omega    
  2. 2.5 pi cross times 10 to the power of negative 12 end exponent capital omega    
  3. 5 cross times 10 to the power of negative 12 end exponent capital omega    
  4. 5 cross times 10 to the power of negative 11 end exponent capital omega    

The correct answer is: 5 cross times 10 to the power of negative 11 end exponent capital omega

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