A) 5 min
B) 8 mm
C) 10 min
D) 20 min
Correct Answer: D
Solution :
\[P\propto {{V}^{2}}\] Since the applied voltage is half the rated value the power becomes\[\frac{1}{4}th\]. Further, since\[P=\frac{H}{t}\], so the time taken to produce same heat will become four times.
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