A basic d’Arsonval movement with internal resistance 100

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A basic d’Arsonval movement with internal resistance 100 Ω and full scale current 1 mA is to be converted into a multirange dc voltmeter with voltage ranges 0 – 10V, 0– 30 V, 0 – 100 V and 0 – 300 V. The circuit arrangement is shown in the figure. The value of R₁ will be ____________

1. 8.8
2. 8
3. 6
4. 9.9

Correct Option: D

	10	= 10^-3
	R₁ + 100

or R₁ + 100 = 10.000
or R₁ = 9900 ohm = 9.9 kΩ