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A 20mv, 1mA d’Arsonval movement is used in an ammeter whose full-scale reading is 10 mA. Determine RA.

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A 20mv, 1mA d’Arsonval movement is used in an ammeter whose full-scale reading is 10 mA. Determine RA.

(a) 2.222Ω

(b) 6.667Ω

(c) 5.92Ω

(d) 3.333Ω

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I'm obligated to ask this question of Measuring Voltage and Current in chapter Simple Resistive Circuits of Electric Circuits

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The correct answer is (a) 2.222Ω

To elaborate: 1 mA flowing through coil implies that 9mA must be diverted through RA.

          V = ir

      20 * 10^-3 = 9 * 10^-3 RA

      RA= 2.222Ω.

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