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In a meter bridge experiment with
resistance R₁ in left gap and resistance X in
right gap, null point is obtained at 40 cm from
left end. With a resistance R₂ in left gap and
same resistance X in right gap, null point is
obtained at 50 cm from left end. Where will be
null point if R₁ and R₂ are put first in series
and then in parallel, in the left gap and eight
gap still containing X?

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