SELECT * FROM question_mgmt as q WHERE id=2237 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=8 AND chapterId=117 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

A negligibly small current is passed through a wire of length 15 m and uniform cross-section 6.0 x 10-7 m2, and its resistance is measured to be 5.0 Ω. What is the resistivity of the material at the temperature of the experiment?

Answer:

Length of the wire, l =15 m

Area of cross-section of the wire, a = 6.0 × 10 - 7 m2

Resistance of the material of the wire, R = 5.0 Ω

Resistivity of the material of the wire = ÃÂ

Resistance is related with the resistivity as

Therefore, the resistivity of the material is 2 × 10 - 7 Ω


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