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Electric Generator

An electric t...

Question

An electric tea kettle has two electric heating coils. When one of the coil is switched on the tea begins to boil in 6 minutes. When the other is switched on, the boiling begins in 8 minutes
If both the coils are now arranged in series and switched on, boiling starts in

A

24 / 7

minutes

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B

12 minutes

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C

14 minutes

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D

4 minutes

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Solution

The correct option is C 14 minutes
When they are connected in series , the total resistance $R = R_{1} + R_{2}$
Resistance is proportional to the temperature. So , $T = T_{1} + T_{2} = 6 + 8 = 14$ mins

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