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DiKsa [7]
4 years ago
13

Anna learned that every magnet has a north and a south end called poles. One day, while she is playing with magnets she notices

that when she puts the north end of a magnet near the south end of another magnet, they pull together. What can Anna conclude from her observation?
A) Opposite poles of magnets repel.
B) Opposite poles of magnets attract.
C) The north pole picks up iron nails.
D) Only the north pole has an attractive force.
Physics
2 answers:
alekssr [168]4 years ago
8 0
B i took the benchmark for k12

maria [59]4 years ago
4 0
B) opposite poles of magnets attract
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Answer:

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Explanation:

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I=\frac{1}{2}*500kg*(1.0m)^2

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K_R=49.348x10^6J

b). The power average 0.8kW un range time can be find

P=\frac{K_R}{t'}

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t=\frac{49.348x10^6}{0.8x10^3w}=6168.5s

t=6168.5s\frac{1minute}{60s}=102.8 minutes

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A 4-79 permalloy solenoid coil needs to produce a minimum inductance of 1.1 . If the maximum allowed current is 4 , how many tur
daser333 [38]

The related concept to solve this exercise is given in the expressions that the magnetic field has both as a function of the number of loops, current and length, as well as inductance and permeability. The first expression could be given as,

The magnetic field H is given as,

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Here,

n = Number of turns of the coil

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l = Length of the coil

From the above equation, the number of turns of the coil is,

n = \frac{Hl}{I}

The magnetic field is again given by,

H = \frac{B}{\mu_t}

Where the minimum inductance produced by the solenoid coil is B.

We have to obtain n, that

n = \dfrac{\frac{B}{\mu_t}l}{I}

Replacing with our values we have that,

n = \dfrac{\frac{1.1Wb/m^2 }{200000}(2m)}{4mA}

n = \dfrac{(\frac{1.1Wb/m^2 }{200000})(\frac{10^4 guass}{1Wb/m^2})(2m)}{4mA(\frac{10^{-3}A}{1mA})}

n = 27.5 \approx 28

Therefore the number of turn required is 28Truns

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4 years ago
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Explanation:

<h3>1.) Regeneration is the natural process of replacing or restoring damaged or missing cells, tissues, organs, and even entire body parts to full function in plants and animals.</h3>

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