A. 96s
B. 1.20s
C. 570s
D. 600s
E. 1200s
Correct Answer:
Option C – 570s
Explanation
Ivt = mcΔθ
t = mcΔθ/Iv
= 3x 4200 x (88 – 28)/6 x 200
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![It takes 4 minutes to boil a quantity of water using an electrical heating coil. How long will it take to boil the same quantity of water using the same coil if the current is doubled? [Neglect any external heat losses]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png "It takes 4 minutes to boil a quantity of water using an electrical heating coil. How long will it take to boil the same quantity of water using the same coil if the current is doubled? [Neglect any external heat losses]")