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An electric kettle has two coils. When o...

An electric kettle has two coils. When one of these is switched on, thje water in the kettle boils in 6 minutes. When the other coil is switched on, the water boils in 3 minutes. If the two coils are connected in series, the time taken to boil the water in the kettle is

A

Zero

B

`(1)/(4piin_(0)).(Q^(2))/(2a)`

C

`(1)/(4piin_(0)).(Q^(2))/(4a)`

D

`(1)/(4piin_(0)).(Q^(2))/(a)`

Text Solution

Verified by Experts

The correct Answer is:
C
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