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A wire of unifonn cross-section is bent in theshape of a complete ring. Two diametrically opposite points on the wire are connected to the two terminals of left gap of a metrebridge. The resistance of 15 n is connected in the right gap. If the null point is obtained at 70 em from the left end of the bridge wire, find the resistance of the wire before bending it to a ring. |
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Answer» Answer: Answer Open in answr app Open_in_app Here we will use the principle of meter bridge So, Q P
= S R
where, P=40ρ [ρ is RESISTANCE/unit length] Q=60ρ S=15 Ω R=10 Ω Now, two POINTS are connected to the diameter of a ring.Therefore we have two PARALLEL path. If the resistance of both the path is r Then equivalent resistance = 2 r
2 r
=10 r=20 Ω |
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