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Moving-coil instruments are polarised, not unpolarised. This is because they are direct current instruments, and the direction of the current determines the direction in which the instrument's point will move. If a moving coil instrument is connected incorrectly, then the instrument will try and read 'downscale' -in other words, the resulting torque will try and move the pointer backwards.
AnswerA moving-iron meter operates by the repulsion between a fixed iron pole piece, and a moving iron pole piece to which the pointer is attached. The magnetic polarity of the fixed and moving pole pieces is determined by the direction of current flowing though a coil. The magnetic polarities induced into the fixed and moving iron pole pieces, when the current flows in one direction, are both north; and, when the current flows in the oppositedirection are both south. So the pole pieces always repel each other, regardless of current direction.
What else can I help you with?
Instrument which does not have restoring torque?
moving iron instruments
Why eddy current damping is not used in moving iron instruments?
because eddy current is produced by the heat produced in winding
What is the construction and working details of moving iron and moving coil ammeters and moving coil voltmeters?
Different b/w a moving coil instrument and a moving iron instrument
What are the advantages and disadvantages of electrostatic instruments?
What are the advantages and disadvantages manx iron instrument
What will happen in the absence of iron cylinder in a moving coil galvanometer?
it will not work
Differences between Permanent magnet moving coil and moving iron?
Permanent magnet moving coil (PMMC) instruments use a moving coil that is suspended between the poles of a permanent magnet, whereas moving iron instruments use a stationary coil and a moving iron piece that moves within the coil's magnetic field. PMMC instruments are more accurate but have limited range, while moving iron instruments are less accurate but can measure higher currents. PMMC instruments are inherently more expensive compared to moving iron instruments.
Instrument which does not have restoring torque?
moving iron instruments
Is Voltmeter is a moving iron Instrument or moving coil instrument?
If this is a homework related question, you really should consider trying to solve it yourself before looking at this answer. Otherwise, the value of the lesson, and the reinforcement provided by the assignment, will be lost to you.A moving coil measuring instrument has a coil attached to the indicator, surrounded by a magnet.A moving iron measuring instrument has a magnet attached to the indicator, surrounded by a coil.In both cases, the indicator is driven by magnetic torque caused by current flow in the coil.
How do unpolarized waves look like?
Unpolarized waves will look random.
Why moving iron is used in both AC and DC current?
A moving iron instrument works by means of a coil that attracts a moving iron mass that is attached to a pivoted pointer which moves across a graduated scale. The iron mass will be attracted towards the coil, regardless of the magnetic polarity of the coil. So, as an AC current continually reverses the magnetic polarity of the coil, the iron mass is always attracted towards the coil, never repelled by it. Similarly, a moving iron instrument doesn't care in which direction a DC current is flowing. So the instrument works equally well with both AC and DC currents. Moving iron instruments, however, are not as accurate as moving coil instruments which, of course, are sensitive to the direction of current.
Why eddy current damping is not used in moving iron instruments?
because eddy current is produced by the heat produced in winding
What instrument measures peak to peak voltage?
All Moving Iron Type measuring instruments major rms value of quantities.
What are the similarities of PMMC and moving iron type measuring instruments?
Both PMMC (Permanent Magnet Moving Coil) and moving iron type measuring instruments are analog devices used for measuring electrical quantities. They both operate based on the interaction between magnetic fields and electric currents to produce a mechanical deflection for display. Additionally, they are both commonly used in applications where accuracy and precision are important factors.
What is unpolarized?
Unpolarized energy is when there are vibrations which are produced randomly in spatial orientation. This will happen in more than one plane.
What is the use of iron clamp and iron stand?
for the light purpose, to handled the instruments
What was the original intensity of the light assuming it started out unpolarized?
The original intensity of unpolarized light is the total intensity of light waves vibrating in all possible directions.
What is the construction and working details of moving iron and moving coil ammeters and moving coil voltmeters?
Different b/w a moving coil instrument and a moving iron instrument
