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Yakvenalex [24]
3 years ago
7

Drawing Conclusions Suppose you take a short piece of wire that is not attached to anything and move it up and down in a magneti

c field. Explain whether or not a current will be induced, and why.
Physics
2 answers:
Ulleksa [173]3 years ago
4 0

Answer: No. Circuit should be closed.

Explanation:

A changing magnetic field induces emf in a circuit which is placed in it. This induced emf causes current to flow through it. This is given by Faraday's law which states that induced emf results due to rate of change of magnetic flux.

e = \frac{-d\phi}{dt}= -\frac {dB A} {dt}

Current flows only through a closed circuit. Thus, when a wire is moved up and down in a magnetic field, it will not induce emf because the wire does not form a loop. It is an open circuit.

blagie [28]3 years ago
3 0
A current will not be induced because the wire is not part of a closed circuit.
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What ocean depth would the volume of an aluminium sphere be reduced by 0.10%
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Answer:

6400 m

Explanation:

You need to use the bulk modulus, K:

K = ρ dP/dρ

where ρ is density and P is pressure

Since ρ is changing by very little, we can say:

K ≈ ρ ΔP/Δρ

Therefore, solving for ΔP:

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We can calculate K from Young's modulus (E) and Poisson's ratio (ν):

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Substituting:

ΔP = E / (3 (1 - 2ν)) (Δρ / ρ)

Before compression:

ρ = m / V

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ρ+Δρ = m / (V - 0.001 V)

ρ+Δρ = m / (0.999 V)

ρ+Δρ = ρ / 0.999

1 + (Δρ/ρ) = 1 / 0.999

Δρ/ρ = (1 / 0.999) - 1

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Given:

E = 69 GPa = 69×10⁹ Pa

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If we assume seawater density is constant at 1027 kg/m³, then:

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6 0
3 years ago
when the particles of the medium move back and forth along the direction of the wave motion, the wave is a
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8 0
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Answer:

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Explanation:

The parallel connection is required not series. A parallel connection is the connection of electronic components (e.g bulbs, LED, resistors, capacitors etc) in such a way that the same voltage is supplied across the ends of the components.  While in a series connection, the components are connected to each other end-to-end.

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