Two metallic wires are lying parallel, if current is in these wires be flowing in same direction, so these wires will ................( Attract each other ).
Because
2 ) Fundamental frequency of stationary waves in an open pipe as compared in frequency of a closed pipes is …………… ,
A ) Remains Same , B ) Two times ,
C ) Three times , D ) None of these ,
Correct Answer : - B ) Two times ,
Because in close pipe we have frequency at first harmonic :-
fc = v / λ , and for close pipe , λ is 4L . So ,
4fc = v / L .………….. eq. ( 1 ) ( For Closed pipe ) .
So , For open pipe , we have frequency at first harmonic : -
fo = v / λ , and for open pipe , λ is 2L . So ,
fo= v / 2L . And we can write it like this ;
2fo = v / L ..…… eq. ( 2 ) ( For open pipe ) .
So , equation 1 = equation 2 ,
So , 4fc = 2fo ,
Then ; (4/2)fc = fo ,
So 2fc = fo OR fo= 2fc .
So , Its is shown that frequency for open pipe is 2 times the frequency in closed pipe .
Now go to online quiz section and check your preparation by this link : -
UG Online quizzes
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Keywords :-
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in these wires be flowing in same direction, so these wires will
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Current flowing in the opposite direction
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