A galvanometer G deflects full scale when a potential difference … - Vidyadip

MCQ

A galvanometer $G$ deflects full scale when a potential difference of $0.50 $ $V$ is applied. The internal resistance of the galvanometer $r_g$ is $25$ $ohms$. An ammeter is constructed by incorporating the galvanometer and an additional resistance $R_S$. The ammeter deflects full scale when a measurement of $2.0$ $A$ is made. The resistance $R_S$ is closest to : ................. $\Omega$

A
$0.25$
B
$2.5$
C
$0.45$
D
$0.1$

✓

Answer

we know to costruct ammeter from galvanometer we add shunt of low reistance in paralle with galvano meter.

$I = i _{ g +} I _{ S }$

$I =2$,

$V$ across $A B=0.50 v$.

$Ig =0.5 / 25=0.02\,V$

$I_{ S }=2-0.02=1.98\,v$

$Rs =0.5 / 1.98=0.252\,V$

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 Magnetic Effect of Current→Magnetic Effect of Current — 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 bomb is kept stationary at a point. It suddenly explodes into two fragments of masses $1 \mathrm{~g}$ and $3 \mathrm{~g}$. The total K.E. of the fragments is $6.4 \times 10^4 \mathrm{~J}$. What is the K.E. of the smaller fragment

When an ideal monoatomic gas is heated at constant pressure, fraction of heat energy supplied which increases the internal energy of gas, is

In the circuit shown below, what will be the readings of the voltmeter and ammeter

In a triode amplifier, $\mu=25, r_p=40$ kilo ohm and load resistance $R_L=10$ kilo ohm. If the input signal voltage is $0.5$ volt, then output signal voltage will be

Which pair of the following forces will never give resultant force of $2 N$

A ship of mass $3 \times 10^7 kg$ initially at rest is pulled by a force of $5 \times 10^4 N$ through a distance of $3 m$. Assume that the resistance due to water is negligible, the speed of the ship is

In case of a forced vibration, the resonance wave becomes very sharp when the

A sphere of radius $r$ is kept on a concave mirror of radius of curvature $R$. The arrangement is kept on a horizontal table (the surface of concave mirror is frictionless and sliding not rolling). If the sphere is displaced from its equilibrium position and left, then it executes S.H.M. The period of oscillation will be

When two bodies collide elastically, then

A body of mass $m$ is at rest. Another body of same mass moving with velocity $\mathrm{V}$ makes head on elastic collision with the first body. After collision the first body starts to move with velocity