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To study a solar battery, a multi-range ...

To study a solar battery, a multi-range voltameter is used, which consists of a sensitive ideal micro-ammeter and a set of additional resistances. The voltmeter is connected across the battery. When `10 V` range is selected on the voltameter, it show `1.4 V` and when `100 V` range is selected, The voltameter shows `2.8 V`. If `1000 V` range is selected, the voltmeter show 4.x, where x is a digit after the decimal point. Calculate value of x.

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