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प्रश्न
Which has more resistance:
a long piece of nichrome wire or a short one?
उत्तर
A long piece of nichrome wire has more resistance because the resistance of a conductor is directly proportional to its length, R α l.
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संबंधित प्रश्न
List the factors on which the resistance of a conductor in the shape of a wire depends.
Which has less electrical resistance : a thin wire or a thick wire (of the same length and same material)?
A wire is 1.0 m long, 0.2 mm in diameter and has a resistance of 10 Ω. Calculate the resistivity of its material?
How does the resistance of a conductor depend on:
area of cross-section of the conductor?
How does the resistance of a conductor depend on:
temperature of the conductor?
How does the resistance of a wire change when:
its material is changed to one whose resistivity is three times?
Calculate the area of cross-section of a wire if its length is 1.0 m, its resistance is 23 Ω and the resistivity of the material of the wire is 1.84 × 10−6 Ω m.
Write the relation between resistance and electrical resistivity of the material of a conductor in the shape of a cylinder of length `'l'` and area of cross-section `'A'` . Hence derive the S.I. unit of electrical resistivity.
A cylindrical conductor of length l and uniform area of cross-section A has resistance R. Another conductor of length 2l and resistance R of the same material has an area of cross-section:
How will the resistance of a wire be affected if its
- length is doubled, and
- radius is also doubled ?
Give justification for your answer.
