Question:
The current sensitivity of a moving coil galvanometer depends on
The current sensitivity of a moving coil galvanometer depends on
Updated On: Jun 7, 2022
- the number of turns in the coil
- moment of inertia of the coil
- current sent through galvanometer
- eddy current in Al frame
Hide Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Current sensitivity $=\frac{nBA}{K}$
where K is constant of torsional rigidity.
B is the magnetic field A is coil area.
where K is constant of torsional rigidity.
B is the magnetic field A is coil area.
Was this answer helpful?
0
0
Top Questions on Electrical Instruments
- Which of the following resistivity (\(\rho\)) vs temperature (T) curves is most suitable to be used in wire-bound standard resistors?
- JEE Main - 2025
- Physics
- Electrical Instruments
- Four identical cells, each with internal resistance 1 \(\Omega\) and emf 10 V are connected in series to a resistance R and they are connected in parallel and then to an external resistance R in series. For what value of R the current in series and in parallel combination is the same?
- AP EAMCET - 2024
- Physics
- Electrical Instruments
The Wheatstone bridge is balanced when \(R_3 = 144 \, \Omega\). If \(R_2\) and \(R_1\) are interchanged, the bridge balances for \(R_3 = 169 \, \Omega\). The value of \(R_4\) is:
- AP EAMCET - 2024
- Physics
- Electrical Instruments
- A coil of 200 turns and area of cross-section \(5 \times 10^{-3} \, m^2\) carries a current of 3 A. - The magnetic moment of the coil is
- TS EAMCET - 2024
- Physics
- Electrical Instruments
- In Geiger-Marsden experiment, if the initial speed of \(\alpha\) particle is doubled, then the closest distance of approach of the \(\alpha\) particle from the gold nucleus - (Assume \(\alpha\) particle is projected straight towards the gold nucleus)
- TS EAMCET - 2024
- Physics
- Electrical Instruments
View More Questions
Notes on Electrical Instruments
Concepts Used:
Electrical Instruments
There are various electrical instruments used to measure current, power, voltage, etc. Some of them are briefly explained below:
Moving Coil Galvanometer
- It is an electromagnetic device which measures small values of current.
- Its working principle is that whenever a current loop is placed in a magnetic field, it experiences a certain torque. The value of that torque can be modified by modifying the current in the loop.
- For a current carrying loop having N turns, and cross sectional area A, carrying current i, whenever it is placed in and along the direction of an external magnetic field B, it experiences a torque given by:
ԏ = NiAB
