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Principle of Working:
A Moving Coil Galvanometer works on the Electromagnetic effect of current carrying coil (free to move) being placed in an air-gap between the soft iron core and the strong pole pieces of the magnet.
The current following in the moving coil which is the specimen to be sensed or measured results in a generation of a Magnetic Field which is opposite to that of the fixed magnetic pole pieces. And as like poles attract each other results in a generation of small deflecting torque which further deflects the pointer or the mirror attached to the axis of the coil.
Construction:
Moving Coil:
The Moving coil which is free to move is being suspended from a soft metallic (non-magnetic) strip carrying the current specimen which is to be sensed or measured. The Moving coil is being suspended in the air-gap available between the fixed Soft Iron-Core and the fixed pole pieces of the magnet.
The Soft Iron Core is used to provide a path of low reluctance so as to focus the magnetic field generated by the fixed magnetic pole pieces towards the moving coil. The use of low reluctance Soft Iron-Core helps to increase the sensitivity of the Galvanometer as well.
In many of the Moving Coil Galvanometer Construction Soft Iron-Core pieces are removed and this results in the reduction of the sensitivity of the Galvanometer as a whole. In absence of the soft fixed iron core in the middle of the coil the coil then is narrowed in order to reduce the free air space, this narrowing of the coil results in the reduction of the Moment of Inertia(MI) of the moving coil arrangement. This results in having a good near to critical damping with very less oscillations.
The Moving coil consists of a large number of turns wounded on a former which can either be in rectangular or circular in shape. The current carrying coil is made up of a thin non magnetic metal so as to have low resistance and less mass.
Damping:
Damping in Moving Coil Galvanometer is provided by an Eddy current damping mechanism. The damping is made as such to have a nearly critical damping by setting the device to be between under-damped and critical damped case.
Controlling Torque:
Spring Control mechanism is largely utilized to provide the suitable controlling torque.
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Can moving coil galvanometer be used to detect ac in a circuit give reason?
Moving coil galvanometer is used to detect unknown resitance of the both ac or dc circuits :)deepak instrumentation engineerAnswerA 'galvanometer' is simply an instrument that detects and measures small currents; 'moving coil' describes its operating principle. A moving-coil galvanometer is a d.c. instrument; if subject to a.c., then it will simply vibrate as it will not be able to respond the the frequency (unless the frequency is very low, in which case, it will sweep back and forth in step with that frequency).The moving-coil principle is applied to other instruments, and can be used in the construction of multimeters. In the case of a multimeter, a rectifier circuit is incorporated so that it can be used to measure a.c. currents and voltages.
Working of moving-coil galvanometer?
A moving coil galvanometer is a type of scanning device used in the transportation and trucking industry. The vehicle is pulled through a fixed scanner while an operator watches a closed circuit television.
What is the working principle of geophone?
Geophone Are Moving Coil Electromagnetic type principle is contained
What is the difference between a galvanometer and an electric motor?
Well, both work on what is termed the 'motor principle', i.e. a current-carrying conductor, when placed in a magnetic field, is subject to a force perpendicular to that field. But that's where the similarity ends, for the operating coil in a galvanometer is restricted to move within an arc, whereas a motor's coil will continuously rotate.
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 the difference between the construction of a moving coil galvanometer and a ballistic galvanometer?
What is the difference between the construction of a moving coil galvanometer and a ballistic galvanometer?
What is the principle of ballistic galvanometer?
The ballistic galvanometer principle states that when a current-carrying coil is suddenly disconnected from a source, the coil carries on moving because of its momentum. The deflection of the coil is proportional to the charge that passed through the coil while it was connected.
Can moving coil galvanometer be used to detect ac in a circuit give reason?
Moving coil galvanometer is used to detect unknown resitance of the both ac or dc circuits :)deepak instrumentation engineerAnswerA 'galvanometer' is simply an instrument that detects and measures small currents; 'moving coil' describes its operating principle. A moving-coil galvanometer is a d.c. instrument; if subject to a.c., then it will simply vibrate as it will not be able to respond the the frequency (unless the frequency is very low, in which case, it will sweep back and forth in step with that frequency).The moving-coil principle is applied to other instruments, and can be used in the construction of multimeters. In the case of a multimeter, a rectifier circuit is incorporated so that it can be used to measure a.c. currents and voltages.
A moving coil galvanometer can be used as an ammeter by adding?
a series resistence with its coil
What are the disadvantages of a moving coil galvanometer?
Some disadvantages of a moving coil galvanometer include its limited range of measurement due to its delicate construction, susceptibility to external magnetic fields which can affect accuracy, and the need for calibration to ensure reliable readings. Additionally, the moving coil galvanometer may have a slow response time compared to other types of meters.
What will happen in the absence of iron cylinder in a moving coil galvanometer?
it will not work
Why is the cylindrical core of soft iron used in moving coil galvanometer?
A cylindrical core of soft iron is used in a moving coil galvanometer because soft iron has high magnetic permeability, meaning it enhances the magnetic field produced by the coil. This helps increase the sensitivity and responsiveness of the galvanometer to small currents passing through the coil.
What is weston galvanometer?
A weston galvanometer is a type of sensitive instrument used to detect and measure small electric currents. It uses a moving coil suspended in a magnetic field to deflect in response to the current passing through it. This deflection is then used to indicate the strength of the current.
Working of moving-coil galvanometer?
A moving coil galvanometer is a type of scanning device used in the transportation and trucking industry. The vehicle is pulled through a fixed scanner while an operator watches a closed circuit television.
Why we use copper wire for moving coil galvanometer?
Copper is used in moving coil galvanometers because it is a good conductor of electricity, which allows for minimal resistance and efficient flow of currents. Additionally, copper is flexible and ductile, making it ideal for winding into a coil to create the moving part of the galvanometer.
Why is a moving coil galvanometer?
A moving coil galvanometer is sensitive and accurately measures small currents due to the rotation of a coil in a magnetic field, producing a deflection proportional to the current. It is preferred for measuring small currents because of its high sensitivity and low electrical resistance.
Why is it necessary to have some form of controlling couple in the moving coil galvanometer?
Having a controlling couple in a moving coil galvanometer is essential to ensure the coil comes back to its original position after deflection. This controlling couple helps to stabilize the movement of the coil and maintain the accuracy of the measurements taken by the galvanometer. Without it, the coil may continue to oscillate or not return to its resting position, leading to inaccurate readings.
