Questions
A wire of cross-sectional are d A, length L1, resistivity and temperature coefficient of resistivity is connected in series to a second wire of length L2, resistivity , temperature coefficient of resistivity and the same area A, so that wires carry same current. Total resistance R is
independent of temperature for small temperature change if (Thermal expansion effect is negligible)
detailed solution
Correct option is B
Let initial resistances of the wires are R1 and R2 respectively. Then R'1 +R'2=R1+R2⇒R11+α1ΔT +R21+α2ΔT=R1+R2⇒R1 α1+R2α2=0⇒ ρ1L1A α1+ρ2L2Aα2=0ρ1L1α1+ρ2L2α2=0Similar Questions
A piece of copper and the other of germanium are cooled from the room temperature to 80K, then which of the following would be correct statement?
799 666 8865
support@infinitylearn.com
6th Floor, NCC Building, Durgamma Cheruvu Road, Vittal Rao Nagar, HITEC City, Hyderabad, Telangana 500081.
JEE Mock Tests
JEE study guide
JEE Revision Notes
JEE Important Questions
JEE Sample Papers
JEE Previous Year's Papers
NEET previous year’s papers
NEET important questions
NEET sample papers
NEET revision notes
NEET study guide
NEET mock tests