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A wire of length 10 cm and radius β4 7 10 m ο΄
connected across the right gap of a meter bridge.
When a resistance of 4.5 ο is connected on the left gap
by using a resistance box, the balance length is found
to be at 60 cm from the left end. If the resistivity of the
wire is R Γ 10β7οm, then value of R is :
(1) 63 (2) 70
(3) 66 (4) 35
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