A galvanometer whose resistance is 120 gives full scale deflectio… - Vidyadip

MCQ

A galvanometer whose resistance is $120 \Omega$ gives full scale deflection with a current of $0.05 A$ so that it can read a maximum current of $10 \mathrm{~A}$. A shunt resistance is added in parallel with it. The resistance of the ammeter so formed is

A
$0.06 \Omega$
B
$0.006 \Omega$
✓
$0.6 \Omega$
D
$6 \Omega \mathrm{s}$

✓

Answer

Correct option: C.

$0.6 \Omega$

(c) Resistance of shunted ammeter $=\frac{G S}{G+S}$Also $\frac{i}{i_g}=1+\frac{G}{S} \Rightarrow \frac{G S}{G+S}=\frac{i_g \cdot G}{i}$$\Rightarrow \frac{G S}{G+S}=\frac{0.05 \times 120}{10}=0.6 \Omega$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "MCQ" from Current Electricity→Current Electricity — all question types→JEE physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

A boy having a mass equal to 40 kilograms is standing in an elevator. The force felt by the feet of the boy will be greatest when the elevator $\left(g=9.8\right.$ metres $\left./ sec ^2\right)$

A block of mass $m$ lying on a rough horizontal plane is acted upon by a horizontal force $P$ and another force $Q$ inclined at an angle $\theta$ to the vertical. The block will remain in equilibrium, if the coefficient of friction between it and the surface is

A $4 \mathrm{~kg}$ mass and a $1 \mathrm{~kg}$ mass are moving with equal kinetic energies. The ratio of the magnitudes of their linear momenta is

A convex lens of focal length $12 \mathrm{~cm}$ is made of glass of $\mu=\frac{3}{2}$.What will be its focal length when immersed in liquid of $\mu=\frac{5}{4}$

In a negative logic the following wave form corresponds to the

The current flowing in two coaxial coils in the same direction. On increasing the distance between the two, the electric current will

A compound microscope has an eye piece of focal length $10 \mathrm{~cm}$ and an objective of focal length $4 \mathrm{~cm}$. Calculate the magnification, if an object is kept at a distance of $5 \mathrm{~cm}$ from the objective so that final image is formed at the least distance vision $(20 \mathrm{~cm})$

In the Young's experiment, If length of wire and radius both are doubled then the value of $Y$ will become

The dimensional formula for Boltzmann's constant is

If an alternating voltage is represented as $\backslash(E=141 \backslash \sin (628 t ) \backslash)$, then the $\backslash( r m s \backslash)$ value of the voltage and the frequency are respectively