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If some additional resistance is added to the voltmeter 2019

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Description

If some additional resistance is added to the voltmeter, the measurement limit of the device increases by 2 times, adding another resistance increases the measurement limit by 5 times. How many times will the measurement limit increase if we connect both resistors in parallel and then connect them to the voltmeter in series?

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Additional information

Task 31666. Detailed solution with a brief record of the conditions, formulas and laws used in the decision, the conclusion of the calculation formula and the answer.
If you have any questions about the decision, write. I will try to help. File in image format.

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