Which device uses a taut band suspension and is designed to detect very small currents?

Which device uses a taut band suspension and is designed to detect very small currents?

• A. Voltmeter
• B. Galvanometer
• C. Ammeter
• D. Ohmmeter

Answer: (B)

Taut band suspension gives moving-coil instruments a very light, precise restoring force, making them extraordinarily sensitive to tiny currents. In a galvanometer, current flows through a coil placed in a strong magnetic field, producing a torque that causes deflection proportional to the current. The taut band acts like a nearly frictionless, small-torque spring, so even minuscule currents produce measurable movement of the pointer. That combination—tiny restoring torque and proportional deflection—lets the galvanometer detect very small currents with high accuracy. The other instruments have different purposes or designs and aren’t built around this ultra-sensitive suspension mechanism for tiny currents.

Taut band suspension gives moving-coil instruments a very light, precise restoring force, making them extraordinarily sensitive to tiny currents. In a galvanometer, current flows through a coil placed in a strong magnetic field, producing a torque that causes deflection proportional to the current. The taut band acts like a nearly frictionless, small-torque spring, so even minuscule currents produce measurable movement of the pointer. That combination—tiny restoring torque and proportional deflection—lets the galvanometer detect very small currents with high accuracy. The other instruments have different purposes or designs and aren’t built around this ultra-sensitive suspension mechanism for tiny currents.