A. 9.6J
B. 2.4J
C. 12.0J
D. 7.2J
Correct Answer:
Option B – 2.4J
Explanation
Energy stored = Ivt = current x back e.m.f x time
= 2 x 3 x 0.4
= 2.4J
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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]")