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Ah, but it does deflect! It quivers back and forth in sync with the polarity of the AC, but except for very low frequencies (e.g. < 1 Hz) you won't be able to see the quivering. I saw it in high school electronics using a hand cranked alternator that generated AC with a period of 20 to 30 seconds.
What else can I help you with?
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.
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.
Steps in making a galvanometer?
Wind a coil of wire around a bobbin to create the coil, which will serve as the moving element of the galvanometer. Attach a pointer or index needle to the coil to indicate the deflection caused by the current passing through the coil. Place the coil and pointer assembly within a magnetic field produced by a permanent magnet to allow for the deflection of the pointer in response to current flow. Connect the coil to a calibrated scale to measure the amount of current based on the deflection of the pointer.
Why is concave mirror used in moving coil galvanometer?
Concave mirrors are used in moving coil galvanometers to magnify the deflection of the coil. The concave mirror reflects the light beam onto a scale, making it easier to measure small deflections accurately. This setup increases the sensitivity and precision of the galvanometer.
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.
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.
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.
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?
Steps in making a galvanometer?
Wind a coil of wire around a bobbin to create the coil, which will serve as the moving element of the galvanometer. Attach a pointer or index needle to the coil to indicate the deflection caused by the current passing through the coil. Place the coil and pointer assembly within a magnetic field produced by a permanent magnet to allow for the deflection of the pointer in response to current flow. Connect the coil to a calibrated scale to measure the amount of current based on the deflection of the pointer.
Why is concave mirror used in moving coil galvanometer?
Concave mirrors are used in moving coil galvanometers to magnify the deflection of the coil. The concave mirror reflects the light beam onto a scale, making it easier to measure small deflections accurately. This setup increases the sensitivity and precision of the galvanometer.
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.
Why steady deflection comes in ballistic galvanometer?
Steady deflection in a ballistic galvanometer occurs because the coil has momentum when current is flowing through it. As the current is interrupted by a switch, the coil continues to rotate due to its inertia, resulting in a steady deflection. The deflection angle is directly proportional to the total charge that passed through the coil during the pulse of current.
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.
What is ballistic galvanometer.Give the construction and theory of moving coil ballistic galvanometer.?
a ballistic galvanometer is a specially designed galvanometer suitable for measuring the total quantity of electricity or charge displaced by a varying current of short duration such as charging & discharging of a capacitor >>>>
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.
Why the coil is like cylindrical shape in moving coil galvanometer?
The coil in a moving coil galvanometer is designed in a cylindrical shape to create a uniform magnetic field when placed between the poles of a magnet. This shape allows for a consistent and efficient interaction between the coil and the magnetic field, enabling accurate measurement of current. Additionally, the cylindrical design facilitates the rotation of the coil within the magnetic field, which is essential for converting the electrical signal into a readable mechanical deflection on the scale.
