Answer:
i = 4.9 A
Explanation:
The expression for the magnetic force in a wire carrying a current is
F = i L x B
bold letters indicate vectors.
The direction of the cable is towards the East, the direction of the magnetic field is towards the North, so the vector product is in the vertical direction (z-axis) upwards and the weight of the cable is vertical downwards. Let's apply the equilibrium condition
F - W = 0
i L B = m g
They indicate the linear density of the cable λ = 0.2 kg / m
λ = m / L
m = λ L
we substitute
i B = λ g
i = 
let's calculate
i = 0.2 9.8 / 0.4
i = 4.9 A
A)
5m/s^2
(12m/s-2m/s)
__________ = 5m/s^2
2s
The cyclist who travels 20 kilometers per hour for 15 kilometers
Hey there!
Here is your answer:
<u><em>The proper answer to this question is option C "</em></u><span><u><em>0.00349".</em></u>
Reason:
</span><span><u><em>1 L = 100 cL. Or 1 cL = 0.01 L</em></u>
</span><span><u><em>34.9 cL = 34.9 / 100 L = 0.349 L</em></u>
</span><span><u><em> 1 hL = 100 L. 0.349 L = 0.349 / 100 hL = 0.00349 hL</em></u>
<em>Therefore the answer is option C!</em>
If you need anymore help feel free to ask me!
Hope this helps!
~Nonportrit</span>
Answer:
Compared with the current in the first coil, the current in the second coil is unchanged.
Explanation:
All coils, inductors, chokes and transformers create a magnetic field around themselves consist of an Inductance in series with a Resistance forming an LR Series Circuit.
The steady state of current in the LR circuit is:
I= V/R (1 - e^-Rt/L)
Where I= current
R= Resistance
V= Voltage
Where R/L is the time constant.
For a conducting wire, it has a very small resistance. The time constant will be in microseconds. The current will be in a steady state after few second. The current is independent on the inductance and dependent on the resistance. The length of wire and the resistance here are the same. Therefore, the current remains unchanged.
