The diameter of the sun is 1.4×10⁹ m whereas the diameter of the earth is 1.2756×10⁷m.Compare the diameter of the sun with the earth.
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The potentiometer is preferred over voltmeter when there is a measurement of emf of the cell because the potentiometer does not draw any current as it is a null device. Whereas voltmeter draws current from the cell.
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Given that Diameter of the Sun is 1.4 x 109 meters and Earth is 1.2768 x 107 meters. = 140 : 1.2768.
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