A galvanometer gives full scale deflection with 0.006 A current. By connecting it to a 4990 Ω resistance, it can be converted into a voltmeter of range 0 - 30 V. If connected to a resistance, it becomes an ammeter of range 0

Engineering

Physics

Galvanometer Ammeter and Voltmeter

Question

A galvanometer gives full scale deflection with 0.006 A current. By connecting it to a 4990 Ω resistance, it can be converted into a voltmeter of range 0 - 30 V. If connected to a $\frac{2 n}{249} Ω$ resistance, it becomes an ammeter of range 0 - 1.5 A. The value of n is

LiveFree JEE Main Previous Year Online Papers Live Free JEE Advance Previous Year Online Papers

College PredictorLive

Know your College Admission Chances Based on your Rank/Percentile, Category and Home State.

Get your JEE Main Personalised Report with Top Predicted Colleges in JoSA

V = i_g (R + G)

30 = 0.006 (4990 + G)

G = 10

$\frac{i (RG)}{R + G} = i_{g} G$

$i = \frac{(R + G) i_{g}}{R}$

$1 .5 = \frac{(10 + \frac{2 n}{249}) 0 .006}{\frac{2 n}{249}}$

n = 5