Question

What will the reading of the voltmeter be at the instant the switch returns to position a if the inertia of the d'Arsonval movement is negligible

Answer 1

hello your question is incomplete attached below is the complete question

answer :

20.16 v

Step-by-step explanation:

The reading of the voltmeter at the instant the switch returns to position a

L = 5H

i ( current through inductor ) = 1/L ∫ V(t) d(t) + Vo

= 1/5 ∫ 3*10^-3 d(t) + 0 = 0.6 * 10^-3 t

iL ( 1.6 s ) = 0.6 * 10^-3 * 1.6 = 0.96 mA

Rm ( resistance ) = 21 * 1000 = 21 kΩ

The reading of the voltmeter ( V )

V = IR

= 0.96 mA * 21 k Ω = 20.16 v