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A galvanometer of resistance math xmlns=http://www.w3.org/1998/Math/MathMLmn50/mnmiΩ/mi/math is connected to a cell of emf math xmlns=http://www.w3.org/1998/Math/MathML class=wrs_chemistrymn3/mn/math Volt, along with another resistance math xmlns=http://www.w3.org/1998/Math/MathMLmn2950/mnmiΩ/mi/math in series. Full scale deflection of math xmlns=http://www.w3.org/1998/Math/MathML class=wrs_chemistrymn30/mn/math division is obtained. In order to reduce deflection to math xmlns=http://www.w3.org/1998/Math/MathML class=wrs_chemistrymn20/mn/math division, the value of extra resistance needed in series is.
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