at 3:20 sir u have mistaken i think,
current is flowing downwards(current always flows from positive to negative end) so now if we apply right hand thumb rule the magnetic field should protrude out of the board towards us i.e outwards
at t=T/2 k taraf jab jate h hum, tab polarity to zero ho jani chahiye na, sirf ghatni nahi chahiye; bcoz according to graph "V=0 or E=0" at t=0,T/2 & T ??
sir ye bandwidth k sare values aiims k liye yaad rakhne h kya??
sir when optical fibre has bandwidth only uptil 100 GHZ(100 x 10^9 Hz) then how can it accomodate waves of tera Hz-1000 teraHz(10^12 to 1000 x 10^12)
sir repeater signal ko strengthen krke kaise retransmit krra h,
i mean repeater me transmitter and receiver k alava amplifier b lga hota h kya??