Question

The temperature coefficient of resistance of a
conductor is 0.0025/°C. At 200 K its resistance is
4 ohm. The resistance of the conductor will be 8 ohm
at temperature about
(1) 400 K
(2) 300 K
(3) 600 K
(4) 800 K​

Answer 1

Answer:

Let R1 be resistance in First case and temperature be t1.

let at t2 temperature resistance will be r2.

.and temperature coefficient of resistance be alpha.

now Given.

R1= 1 ohm

R2 = 2ohm

t1= 300K = 27°C .

t2= ?.

see picture!!for solution!!....

since !!.

option d is correct...

hope it helped you!!....

Answer 2

Answer:

correct answer is 600K not 800K correct it in your books also