# Lesson Worksheet: The Moving-Coil Galvanometer Physics

In this worksheet, we will practice describing the application of the motor effect to the measuring of an electric current by a moving-coil galvanometer.

Q1:

The arm of a moving-coil galvanometer is deflected through an angle of when the current through the galvanometer is 180 μA. What is the sensitivity of the galvanometer? Answer to two decimal places.

Q2:

The diagram shows a cross-section of a moving-coil galvanometer. Which of the following diagrams most correctly represents the magnetic field around the galvanometer core? • A • B • C • D • E Q3:

The diagram shows a moving-coil galvanometer. The terminals of the galvanometer are connected to a direct-current source. Which of the terminals A or B connects to the positive output of the source? • ATerminal B
• BTerminal A

Q4:

The diagram shows a moving-coil galvanometer. Full-scale deflection of the galvanometer arm occurs when the galvanometer coils carry a current with a magnitude of 150 μA. Which of the following must be true of the current that passes from contact A to contact B? • A
• B μA
• C
• D μA
• E

Q5:

The diagram shows a moving-coil galvanometer. Full-scale deflection of the galvanometer arm occurs when the galvanometer coils carry a current with a magnitude of 150 μA. Which of the following must be true of the current that passes from contact A to contact B? • A
• B μA
• C
• D
• E μA

Q6:

The diagram shows a moving-coil galvanometer. Which of the following is the purpose of the labeled component? • AThe component carries current.
• BThe component provides a restoring force on the galvanometer coil.
• CThe component allows the deflection of the galvanometer arm to be measured.
• DThe component produces a magnetic field.
• EThe component increases the magnetic flux density of an induced magnetic field.

Q7:

The diagram shows a moving-coil galvanometer. The terminals of the galvanometer are connected to a direct-current source. Which of the terminals A or B connects to the positive output of the source? • ATerminal A
• BTerminal B

Q8:

The arm of a moving-coil galvanometer is deflected through an angle of when the current through the galvanometer is 360 μA. The maximum deflection angle for the arm is . What is the maximum value of current that the galvanometer can measure? Answer to the nearest microampere.

Q9:

The diagram shows a moving-coil galvanometer. The arm of the galvanometer points to the center of the scale. The maximum current that the wires connected to the galvanometer can carry is 240 μA. Which of the following must be true of the current through the galvanometer coil? • A
• B μA
• C μA
• D
• E

Q10:

The diagram shows a moving-coil galvanometer. Which of the following is the purpose of the labeled component? • AThe component allows the deflection of the galvanometer arm to be measured.
• BThe component carries current.
• CThe component increases the strength of an induced magnetic field.
• DThe component produces a magnetic field.
• EThe component provides a restoring force on the galvanometer coil.