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A moving-iron instrument works on the principle of repulsion between the like magnetic poles (like poles repel) induced in two soft-iron pole pieces (one fixed, the other moving and deflecting the pointer), by the current flowing in a coil. This force of repulsion isn't linear -it reduces the further apart the pole pieces become, obeying what is known as the 'inverse square' law. So, the non-linear scale over which the pointer moves reflects the non-linearity of the force deflecting the pointer. The effect of this non-linearity can be reduced by carefully shaping the fixed pole piece so that the effective surface areas of the two pole pieces are modified as they move apart, partly compensating for the loss of linearity by the force, as they move further apart.
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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
Instrument which does not have restoring torque?
moving iron instruments
Why soft iron is placed in moving coil galvanometer?
1. to intensify the magnetic field by reducing the length of airgap across which the magnetic flux has to pass; 2. to give a radial magnetic flux of uniform density, thereby enabling the scale to be uniformly divided.
Why are moving iron instruments unpolarized?
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 are the advantages and disadvantages of electrostatic instruments?
What are the advantages and disadvantages manx iron instrument
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
Is megger related to hot wire instrument moving coil or moving iron?
It is related to moving coil type instrument
Instrument which does not have restoring torque?
moving iron instruments
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.
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.
What is moving coil voltmeter?
mic or moving iron coil is instrument type works on ac and dc
What is moving coil type voltmeters?
mic or moving iron coil is instrument type works on ac and dc
Why are moving iron instruments unpolarized?
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.
Why soft iron is placed in moving coil galvanometer?
1. to intensify the magnetic field by reducing the length of airgap across which the magnetic flux has to pass; 2. to give a radial magnetic flux of uniform density, thereby enabling the scale to be uniformly divided.
How do you iron your cadet uniform?
With an iron
Which type of instrument are most economical and suitable for measurement of high AC DC voltage?
moving iron and eletrostatic type
What instrument measures both ac and DC?
hot wire ammmeter or a moving iron ammeter will work for ac and dc.
