Assuming our "closed tube" is closed at only one end, then
<span> v = fλ = f*4L/n
</span><span> where "n" is the harmonic number. So
</span><span> L = nv / 4f = n*346m/s / 4*256Hz = n*0.38 m
</span> <span>Since the only option in your list that is an integer multiple of 0.38 m is 1.35 m
</span><span> I'd say that we're hearing the fourth harmonic.
answer is
</span><span>A. 1.35 m</span><span>
</span>
The value of the equivalent resistance for the three resistors connected in series will be the sum of the three values.
To find the answer, we have to know more about the equivalent resistance.
<h3>
What is meant by equivalent resistance?</h3>
- equivalent resistance is the total value of the resistance connected in a circuit.
- If n resistors are connected in series, then the equivalent resistance will be,
- In our question we have three resistors. Thus, the equivalent resistance will be,
Thus, we can conclude that, the value of the equivalent resistance for the three resistors connected in series will be the sum of the three values.
Learn more about the equivalent resistance here:
brainly.com/question/11603204
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Should be just 2 km. - 2 km would mean it is moving in the opposite direction which come to think of it may be fine. You really can't tell.
It’s C because just trust
Given that,
Speed = 3.5 m/s
Magnetic field = 50μT
Angle = 60°
(A). We need to find the direction of magnetic force
Using formula of magnetic force
Here, = down
But , charge is negative.
So, the direction of magnetic force will be up.
(B). We need to calculate the magnetic electric field
Using formula of magnetic force
Where, v = speed
B = magnetic field
Put the value into the formula
Hence, (A). The direction of magnetic force is UP
(c) is correct option
(B). The magnetic electric field is
(b) is correct option