A heating element using nichrome connected to a 230V supply draws an initial current of 3.2A which settles after a few seconds to a steady value of 2.8A. What is the steady temperature of the heating element if the room temperature is $27.0 ° C$ ? Temperature coefficient of resistivity of nichrome averaged over the temperature range involved is $1.70 \times 10^{- 4} / C^{0}$ ?

see full answer

Talk to JEE/NEET 2025 Toppers - Learn What Actually Works!

Real Strategies. Real People. Real Success Stories - Just 1 call away

An Intiative by Sri Chaitanya

$1040 ° C$

$840 ° C$

$1067 ° C$

$871 ° C$

answer is B.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

$v = iR = i' R'$

$3.2 R_{0} (1 + 27 α) = 2.8 R_{0} (1 + αt)$

$8 (1 + 27 α) = 7 (1 + αt)$

$1 = α (7 t - 216) \frac{10^{4}}{1.7} = (7 t - 216) t ≅ 872^{0} C$

Watch 3-min video & get full concept clarity

JEE

NEET

Foundation JEE

Foundation NEET

CBSE