Voltmeter range

We have a voltmeter which, in the original set, measures voltage to 10V. Calculate the size of the ballast resistor for this voltmeter if we want to measure the voltage up to 50V. Voltmeter's internal resistance is 2 kiloohm/Volt.

Correct answer:

R2 =  80000 Ω

Step-by-step explanation:

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