Find the resistance of the given wire by a metre bridge and hence determine the
specific resistance of material of the given wire.
Answers
Answer:
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Explanation:
Aim
To find resistance of a given wire using metre bridge and hence determine the resistivity (specific resistance) of its material.
Apparatus
A metre bridge (slide wire bridge), a Leclanche cell (Battery eliminator), a galvanometer, a resistance box, a jockey, a one way key, a resistance wire, a screw gauge, a metre scale, a set square, connecting wires and a piece of sand paper.
Theory
(i) The unknown resistance X is given by
where, R is known resistance placed in the left gap and unknown resistance X in the right gap of metre bridge. I cm is the length of metre bridge wire from zero end upto balance point.
(ii) Specific resistance (p) of the material of the given wire is given by where, L is the length and D is the diameter of the given wire.