The earth has a vertical electric field at the surface, pointing down, that averages 100 N/C. This field is maintained by variou
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Answer
given,
force per unit length = 350 µN/m
current, I = 22.5 A
y = y = 0.420 m
I₂ = 32.67 A
distance where the magnetic field is zero
there the distance at which the magnetic field is zero in the two wire is at 0.248 m.
Answer:
25.5 m/s
Explanation:
The Doppler effect occurs when there is relative motion between a source of a wave and an observer. In such situation, there is a shift in the apparent frequency of the wave perceived by the observer.
The formula that gives the apparent frequency perceived by the observer is:
where
f is the real frequency of the wave
f' is the apparent frequency of the wave
v is the speed of the wave
is the velocity of the source (negative if the source is moving towards the observer, positive otherwise)
is the velocity of the observer (positive if the observer is moving towards the source, negative otherwise)
In this problem:
v = 340 m/s is the speed of sound
f = 800 Hz is the frequency of the horn
f' = 860 Hz is the apparent frequency
(the observer is at rest)
Re-arranging the equation for , we can find the velocity of the horn and the driver:
So, 25.5 m/s towards the observer.