The current sensitivity of a moving coil galvanometer can be increased by-
A. Decreasing the magnetic field
B. Increasing the number of turns
C. Increasing the area of the coil
D. Inserting a soft iron core in the coil
E. Decreasing the area of the coil
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) - B, C, D Only
The current sensitivity of a galvanometer is -
$\frac{θ}{I}=\frac{nBA}{K}$
where,
θ → Deflection
I → Current
n → Number of turns
B → Strength of Magnetic field
A → Area of coil
B. Yes, by increasing the number of turns in coil.
$⇒S∝N$
C. Yes, by increasing the area of the coil
$⇒S∝A$
D. When a soft iron core inserted, the strength of magnetic field increases.
$⇒S∝B$