Galvanometer Principle

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What is the working principle of a galvanometer?
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A galvanometer works on the principle that a current-carrying coil placed in a magnetic field experiences a torque, causing it to rotate.
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What is the role of the magnetic field in a galvanometer?
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The magnetic field provides the necessary force that interacts with the current-carrying coil to produce a measurable rotation of the needle.
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How does the pointer in a galvanometer indicate current?
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The pointer attached to the rotating coil deflects over a scale, with the angle of deflection indicating the intensity of the current.
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What type of current does a galvanometer measure?
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A galvanometer measures direct current (DC).
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Why is damping necessary in a galvanometer?
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Damping is necessary to prevent the pointer from oscillating and to make it quickly settle at the correct position.
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What is a moving coil galvanometer?
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A moving coil galvanometer is a device where a coil suspended in a magnetic field rotates to measure current.
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How is sensitivity increased in a galvanometer?
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Sensitivity in a galvanometer is increased by using a stronger magnetic field and increasing the number of turns in the coil.
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What is the purpose of a suspension wire in a galvanometer?
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The suspension wire holds the coil and provides electrical connections, allowing it to rotate freely while carrying current.
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What happens when a galvanometer is connected in series with a circuit?
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When a galvanometer is connected in series, it measures the total current flowing through the circuit.
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Name two types of damping used in galvanometers.
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Two types of damping used in galvanometers are eddy current damping and air damping.
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What is the zero current position in a galvanometer?
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The zero current position is where the pointer rests when no current flows, typically at the center or one end of the scale.
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How does a galvanometer differ from an ammeter?
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A galvanometer can detect and measure small currents, while an ammeter is an extension with added resistance to measure larger currents.
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Why is a soft iron core used in galvanometers?
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A soft iron core intensifies the magnetic field within the coil, increasing the device's sensitivity to current.
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What is the function of a hair spring in a galvanometer?
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The hair spring provides a restoring force that helps the coil return to zero position when current is removed.
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How does temperature affect a galvanometer's accuracy?
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Temperature variations can affect the resistance of the coil, impacting the galvanometer's sensitivity and accuracy.
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