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The following data were obtained when a wire was stretched within the elastic region Force applied to wire 100 N
Area of cross-section of wire 10 to the power of negative 6 end exponent m to the power of 2 end exponent
Extensional of wire 2 cross times 10 to the power of negative 9 end exponent m
Which of the following deductions can be correctly made from this data?
I. The value of Young’s Modulus is 10 to the power of 11 end exponent N blank m to the power of negative 2 end exponent
II. The strain is 10 to the power of negative 3 end exponent
III. The energy stored in the wire when the load is applied is 10 J

Physics-General

  1. 1, 2, 3 are correct    
  2. 1, 2 correct    
  3. 1 only    
  4. 3 only    

    Answer:The correct answer is: 1, 2 correctStress = fraction numerator 100 N over denominator 10 to the power of negative 6 end exponent m to the power of 2 end exponent end fraction equals 10 to the power of 8 end exponent blank N m to the power of negative 2 end exponent
    Strain equals blank fraction numerator 2 cross times 10 to the power of negative 3 end exponent over denominator 2 end fraction equals 10 to the power of negative 3 end exponent
    Young modulus
    = fraction numerator 10 to the power of 8 end exponent over denominator 10 to the power of negative 3 end exponent end fraction blank N m to the power of negative 2 end exponent equals 10 to the power of 11 end exponent blank N m to the power of negative 2 end exponent
    Energy stored = fraction numerator 1 over denominator 2 end fraction cross times 100 blank cross times 2 cross times 10 to the power of negative 3 end exponent blank J
    = 10minus1H = 0.1J

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