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प्रश्न
A given wire is stretched to double its length. How will its resistance change?
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उत्तर
When a given wire is stretched to double its length, its area of cross-section will be halved, so the resistance of wire will become four times.
संबंधित प्रश्न
The figure given below shows three resistors?
Their combined resistance is:
(a) `1 5/7`Ω
(b) `14` Ω
(c) `6 2/3` Ω
(d) `7 1/2` Ω
A wire of resistance R1 is cut into five equal pieces. These five pieces of wire are then connected in parallel. If the resultant resistance of this combination be R2, then the ratio `R_1/R_2` is:
(a) `1/25`
(b)1/5
(c)5
(c)25
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