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17.9 Write a note on superconductors.
 17.9 Write a note on superconductors.

17.9 Write a note on superconductors.

17.5 What is meant by strain energy? How can it be determined from the force-extension graph?
 17.5  What is meant by strain energy? How can it be determined from the force-extension graph?

17.5 What is meant by strain energy? How can it be determined from the force-extension graph?

17.4 What stress would cause a wire to increase in length by 0.01 \% if the Youngs modulus of the wire is 12 \times 10^{10} \mathrm{~Pa} . What force would produce this stress if the diameter of the wire is 0.56 \mathrm{~mm} ?(Ans: 1.2 \times 10^{8} \mathrm{~Pa} 2.96 \mathrm{~N} )
 17.4  What stress would cause a wire to increase in length by  0.01 \%  if the Youngs modulus of the wire is  12 \times 10^{10} \mathrm{~Pa} . What force would produce this stress if the diameter of the wire is  0.56 \mathrm{~mm}  ?(Ans:  1.2 \times 10^{8} \mathrm{~Pa} 2.96 \mathrm{~N}  )

17.4 What stress would cause a wire to increase in length by 0.01 \% if the Youngs modulus of the wire is 12 \times 10^{10} \mathrm{~Pa} . What force would produce this stress if the diameter of the wire is 0.56 \mathrm{~mm} ?(Ans: 1.2 \times 10^{8} \mathrm{~Pa} 2.96 \mathrm{~N} )

17.11 What is meant by hysteresis loss? How is it used in the construction of a transformer
17.11 What is meant by hysteresis loss? How is it used in the construction of a transformer

17.11 What is meant by hysteresis loss? How is it used in the construction of a transformer

17.6 A cylindrical copper wire and a cylindrical steel wire each of length 1.5 \mathrm{~m} and diameter 2.0 \mathrm{~mm} are joined at one end to form a composite wire 3.0 \mathrm{~m} long. The wire is loaded until its length becomes 3.003 \mathrm{~m} . Calculate the strain in copper and steel wires and the force applied to the wire. (Youngs modulus of copper is 1.2 \times 10^{11} \mathrm{~Pa} and for steel is 2.0 \times 10^{11} \mathrm{~Pa} ).(Ans: 1.25 \times 10^{-3} 7.5 \times 10^{-4} 477 \mathrm{~N} )
 17.6  A cylindrical copper wire and a cylindrical steel wire each of length  1.5 \mathrm{~m}  and diameter  2.0 \mathrm{~mm}  are joined at one end to form a composite wire  3.0 \mathrm{~m}  long. The wire is loaded until its length becomes  3.003 \mathrm{~m} . Calculate the strain in copper and steel wires and the force applied to the wire. (Youngs modulus of copper is  1.2 \times 10^{11} \mathrm{~Pa}  and for steel is  2.0 \times 10^{11} \mathrm{~Pa}  ).(Ans:  1.25 \times 10^{-3} 7.5 \times 10^{-4} 477 \mathrm{~N}  )

17.6 A cylindrical copper wire and a cylindrical steel wire each of length 1.5 \mathrm{~m} and diameter 2.0 \mathrm{~mm} are joined at one end to form a composite wire 3.0 \mathrm{~m} long. The wire is loaded until its length becomes 3.003 \mathrm{~m} . Calculate the strain in copper and steel wires and the force applied to the wire. (Youngs modulus of copper is 1.2 \times 10^{11} \mathrm{~Pa} and for steel is 2.0 \times 10^{11} \mathrm{~Pa} ).(Ans: 1.25 \times 10^{-3} 7.5 \times 10^{-4} 477 \mathrm{~N} )

17.3 A wire 2.5 \mathrm{~m} long and cross-section area 10^{-5} \mathrm{~m}^{2} is stretched 1.5 \mathrm{~mm} by a force of 100 \mathrm{~N} in the elastic region. Calculate(iii) the energy stored in the wire.
 17.3  A wire  2.5 \mathrm{~m}  long and cross-section area  10^{-5} \mathrm{~m}^{2}  is stretched  1.5 \mathrm{~mm}  by a force of  100 \mathrm{~N}  in the elastic region. Calculate(iii) the energy stored in the wire.

17.3 A wire 2.5 \mathrm{~m} long and cross-section area 10^{-5} \mathrm{~m}^{2} is stretched 1.5 \mathrm{~mm} by a force of 100 \mathrm{~N} in the elastic region. Calculate(iii) the energy stored in the wire.