Answer:
All the given options will result in an induced emf in the loop.
Explanation:
The induced emf in a conductor is directly proportional to the rate of change of flux.
where;
A is the area of the loop
B is the strength of the magnetic field
θ is the angle between the loop and the magnetic field
<em>Considering option </em><em>A</em>, moving the loop outside the magnetic field will change the strength of the magnetic field and consequently result in an induced emf.
<em>Considering option </em><em>B</em>, a change in diameter of the loop, will cause a change in the magnetic flux and in turn result in an induced emf.
Option C has a similar effect with option A, thus both will result in an induced emf.
Finally, <em>considering option</em> D, spinning the loop such that its axis does not consistently line up with the magnetic field direction will<em> </em>change the angle<em> </em>between the loop and the magnetic field. This effect will also result in an induced emf.
Therefore, all the given options will result in an induced emf in the loop.
The molten iron has currents of its own, just like an ocean, and these moving currents create the magnetic field. But the currents are not consistent and the Earth's magnetic field moves around, with the magneticnorth pole currently drifting by about 10 miles a year.
Answer:
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Explanation:
Answer:
To reverse all types of defects.
Explanation:
In the magnetic particle inspection method the material which is used in testing will utilize the magnet which is ferromagnetic and it is high permeable and the retentivity of this magnet is low.
It is a technique which is not destructive and this technique is used for detecting the surface and the hollow part of ferromagnetic substance and will reverse all these defects.
Therefore, circular and longitudinal way of magnetization will reverse all the types of defect.