A Ballistic galvanometer of constant equal to 1 micro coulomb/degree gives a throw of 22.5°, when a capacitor discharges through the meter. If a battery of 15 V is used to recharge the capacitor, value of capacitance is
1.5 μF
The charge that flows through the ballistic galvanometer equals the charge that was stored on the capacitor.
Step 1 — Charge from the throw:
\[Q = k\theta = (1\,\mu\text{C/deg})(22.5^\circ)=22.5\,\mu\text{C}\]
Step 2 — Capacitance from Q = CV:
\[C=\dfrac{Q}{V}=\dfrac{22.5\,\mu\text{C}}{15\,\text{V}}=1.5\,\mu\text{F}\]
Therefore C = 1.5 μF.
Important Questions from Indicating Instruments
Hot wire ammeters are used for measuring
Which one of the following force is not needed for the satisfactory operation of any indicating (or measuring) instrument?
Assertion (A): Shunt of an ammeter has a low resistance
Reason (R): Shunt may be connected in series or in parallel with an ammeter.Which of the following statements are correct?
A. Ultrasonic method for liquid level measurement is not preferred in industrial applications.
B. In a pH meter, the glass electrode is the reference electrode.
C. A chromatograph is used for analyzing the composition of a gas.
D. The production of Korotkoff sounds in indirect blood pressure measurement is due to pressure pulses produced due to the difference in systolic and diastolic blood pressure.
Choose the correct answer from the options given below:
- Which instrument is representing an integrating type instrument?
