Answer:
The answer to this question is given below in the explanation section.
Explanation:
Give the relation of resistance of wire with the length and thickness:
Resistance:
There is a resistance to the flow of an electric current through most conductors.
The length of wire increases
The thickness of wire decreases
The resistance of a long wire is greater then the resistance of a short wire because electrons collide with more ions as they pass through.
The relationship between resistance and wire length is proportional. The resistance of thin wire is greater then the resistance of a thick wire because a thin wire has fewer electrons to carry the current.The relationship between resistance and the area of the cross section of wire is inversely proportional.
Answer:
0.823 Nm
Explanation:
current, i = 100 A
radius, r = 10 cm
Angle between the normal and the magnetic field, θ = 30°
Magnetic field, B = 0.524 T
Torque is defined as the
![\tau = i \times A\ B\times sin\theta](https://tex.z-dn.net/?f=%5Ctau%20%3D%20i%20%5Ctimes%20A%5C%20B%5Ctimes%20sin%5Ctheta)
![\tau = 100 \times 3.14\times 0.1\times 0.1\ 0.524\times 0.5](https://tex.z-dn.net/?f=%5Ctau%20%3D%20100%20%5Ctimes%203.14%5Ctimes%200.1%5Ctimes%200.1%5C%200.524%5Ctimes%200.5)
Torque = 0.823 Nm
Thus, the torque is 0.823 Nm.
Answer:
The magnetic flux density is ![2.11\times10^{-6}\ T](https://tex.z-dn.net/?f=2.11%5Ctimes10%5E%7B-6%7D%5C%20T)
Explanation:
Given that,
Distance = 0.36 m
Current = 3.8 A
We need to calculate the magnetic flux density
Using formula of magnetic field
![B =\dfrac{\mu_{0}I}{2r}](https://tex.z-dn.net/?f=B%20%3D%5Cdfrac%7B%5Cmu_%7B0%7DI%7D%7B2r%7D)
Where,
r = radius
I = current
Put the value into the formula
![B =\dfrac{4\pi\times10^{-7}\times3.8}{2\times\pi\times0.36}](https://tex.z-dn.net/?f=B%20%3D%5Cdfrac%7B4%5Cpi%5Ctimes10%5E%7B-7%7D%5Ctimes3.8%7D%7B2%5Ctimes%5Cpi%5Ctimes0.36%7D)
![B=2.11\times10^{-6}\ T](https://tex.z-dn.net/?f=B%3D2.11%5Ctimes10%5E%7B-6%7D%5C%20T)
Hence, The magnetic flux density is ![2.11\times10^{-6}\ T](https://tex.z-dn.net/?f=2.11%5Ctimes10%5E%7B-6%7D%5C%20T)
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Choice-A is the correct one. It doesn't say it, but it means he'll see the ball reach the catcher's mitt first BEFORE HE HEARS IT slap the mitt.