AP and TS EAMCET Engineering Model Paper 13

A resistance ‘R’ carries a current ‘i’. The power lost to the surroundings is λ(θ−θ‌0). Here ‘λ’ is a constant, ‘θ’ is temperature of the resistance and θ‌0 is the temperature of the atmosphere. If the coefficient of linear expansion is ‘α’, then the strain in the resistance is: