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A voltmeter consists of a 25 Ω coil connected in series with a 575 Ω resistor. The coil takes 10 mA for full scale deflection.

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A voltmeter consists of a 25 Ω coil connected in series with a 575 Ω resistor. The coil takes 10 mA for full scale deflection. What maximum potential difference can be measured on this voltmeter ? 

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Full deflection current = 10 mA = (10 x 10-3)A

Reff = (575 + 25) Ω = 600 Ω

V =  Reff x i = 600 x 10 x 10-3 = 6V

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