What is the required resistance of the heater coil of an immersion heater that will increase the temperature of 1.50 kg of water from 10°C to 50°C in 10 minutes while operating at 240V ?

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25Ω

12.5Ω

250Ω

137.2Ω

answer is D.

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Detailed Solution

use Joule’s lawQ=msΔT⇒ but Q=i2RT⇒ΔTαi2

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