The question for this problem would be the minimum headphone delay, in ms, that will cancel this noise.
The 200 Hz. period = (1/200) = 0.005 sec. It will need to be delayed by 1/2, so 0.005/2, that is = 0.0025 sec. So converting sec to ms, will give us the delay of:Delay = 2.5 ms.
I think 100,375 J.
Hope it helps :)
A current is just the development of electrons. Since there is no electric field from a (steady) current, this implies the wire is still electrically unbiased, ie uncharged. Accordingly the appropriate response is no charge. I trust the appropriate response will help you.
You need to convert minutes to hours so