by using a low resistance shunt
by using a high series resistance
by eliminating the control springs
by making control springs of large moment of inertia
Answer is Right!
Answer is Wrong!
The correct answer is: A. by using a low resistance shunt.
A moving-coil permanent-magnet instrument can be used as a flux meter by using a low resistance shunt. A shunt is a device that is connected in parallel with a meter to divert some of the current away from the meter. This reduces the current through the meter, which in turn reduces the deflection of the needle. The lower the resistance of the shunt, the more current will be diverted away from the meter, and the smaller the deflection of the needle will be. This makes the meter more sensitive to small changes in current.
The other options are incorrect because:
- Option B: Using a high series resistance will make the meter less sensitive to small changes in current.
- Option C: Eliminating the control springs will cause the meter to drift and become inaccurate.
- Option D: Making control springs of large moment of inertia will make the meter less responsive to changes in current.