Current Electricity Charging Discharging Of Capacitors Question 364
Question: Resistance of tungsten wire at $ 150{}^\circ C $ is $ 133,\Omega $ . Its resistance temperature coefficient is $ 0.0045/{}^\circ C $ . The resistance of this wire at $ 500{}^\circ C $ will be
[DPMT 2004]
Options:
A) $ 180,\Omega $
B) $ 225,\Omega $
C) $ 258,\Omega $
D) $ 317,\Omega $
Show Answer
Answer:
Correct Answer: C
Solution:
$ \frac{R _{150}}{R _{500}}=\frac{[1+\alpha (150)]}{[1+\alpha (500)]} $ . Putting $ R _{150}=133\Omega $ and $ \alpha =0.0045/{}^\circ C, $ we get $ R _{500}=133\Omega \times \frac{[1+\alpha (500)]}{[1+\alpha (150)]} $
BETA
