Question
What is the effect on the resistance due to increase in the temperature?
✓
Answer
Due to small change in temperature, there is no change in thermal expansion but for more change in temperature of resistance, ratio of length and area of crosssection will decrease which will affect the resistance.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
What is the speed of light in a denser medium of polarising angle 30°?
Nichrome and copper wires of same length and same radius are connected in series. Current I is passed through them. Which wire gets heated up more? Justify your answer.
Write Faraday's laws of electromagnetic induction.
Express the speed of transmission of electromagnetic wave in terms of peak values of electric and magnetic fields.
A point charge Q is placed at point ‘O’ as shown in the figure. Is the potential at point A, i.e. VA, greater, smaller or equal to potential, VB, at point B, when Q is (i) positive, and (ii) negative charge?
A diverging lens of focal length 20cm and a converging mirror of focal length 10cm are placed coaxially at a separation of 5cm. Where should an object be placed so that a real image is formed at the object itself?
When a semiconducting material is doped with an impurity, new acceptor levels are created. In a particular thermal collision, a valence electron receives an energy equal to 2kT and just reaches one of the acceptor levels. Assuming that the energy of the electron was at the top edge of the valence band and that the temperature T is equal to 300K, find the energy of the acceptor levels above the valence band.
Why cannot we use Si and Ge in fabrication of visible LEDs?
Find the excess pressure inside:
- A drop of mercury of radius 2mm.
- A soap bubble of radius 4mm.
- An air bubble of radius 4mm formed inside a tank of water. Surface tension of mercury, soap solution and water are 0.465N/m, 0.03N/m and 0.076N/m respectively.
Which radiations do not produce photo-electric effect in metals?