KCET2024PhysicsCurrent Electricity
In an experiment to determine the temperature coefficient of resistance of a conductor, a coil of wire X is immersed in a liquid. It is heated by an external agent. A meter bridge set up is used to determine resistance of the coil X at different temperatures. The balancing points measured at temperatures t₁=0^ C and t₂=100^ C are 50 cm and 60 cm respectively. If the standard resistance taken out is S=4 in both trials
Options
- A0.05^ C ⁻¹
- B0.02^ C ⁻¹
- C0.005^ C ⁻¹
- D2.0^ C ⁻¹
Correct answer
C. 0.005^ C ⁻¹
Step-by-step solution
Standard resistance, S=4 At t₁=0^ C , l₁=50 ~cm R₁= l₁ 100-1 S= 50 100-50 4=4 At t₂=100^ , l₂=60 ~cm R₂= l₂ 100-l₂ S= 60 100-60 4=6 Temperature coefficient of the coil, = R₂-R₁ R₁ t₂-R₂ t₁ = 6-4 4 100-6 0 = 1 200 =0.005^ C ⁻¹