Two identical loudspeakers are placed on...

Two identical loudspeakers are placed on a line at distance `4m` and `6m` from a microphone lying on the line joining them. The output of each speaker at the microphone is `2mW`. If the two speakers are connected in series and excited by the same oscillator and they vibrate in phase with each other, the resultant ouput of the microphone will be
(frequency of oscillator `=660 Hz` and speed of sound `=330 m//s`)

zero

`2 mW`

`4 mW`

`8 mW`

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