high resistance voltmeter connected across the cell reads 1.5 volt. when 4 ohm resistance is connected across its terminal the reading falls to 1.2 V. what is the internal resistance of the cell?
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Explanation:
Given E=1.5 volt, V=1.2volt, R=4R
we know that
r=( V/E-1)R
r=( 1.5/1.2-1)*4
=( 1.25-1)*4
=1 ohm
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