A. strong spring
B. low numbers of turns
C. small area of coil
D. soft iron core
Correct Answer: Option D
D. soft iron core
![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]")
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