What length of a copper wire of cross-sectional are 0-01 mm 2- resistivity 1-7 - 10-8 Ohm m- will be needed to prepare a resistance of 1-7 k - -A- 0-1 kmB- 0-7 kmC- 1 kmD- 10 km

The correct option is C 1 km Using R = ρL/A, We get Length(L) = 1 km. ...

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Standard IX

Physics

Factors That Influence Resistance

What length o...

Question

What length of a copper wire of cross-sectional are 0.01 mm², resistivity 1.7 × 10^–8 Ohm m, will be needed to prepare a resistance of 1.7 kΩ?

0.1 km

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0.7 km

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1 km

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10 km

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Solution

The correct option is C
1 km

Using R = ρ $\frac{L}{A}$ ,

We get Length(L) = 1 km.

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Q. What length of a copper wire of cross-sectional area 0.01 mm² will be needed to prepare a resistance of 1 kΩ? Resistivity of copper = 1.7 × 10^–8 Ωm

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What length of a copper wire of cross-sectional are 0.01 mm2, resistivity 1.7 × 10–8 Ohm m, will be needed to prepare a resistance of 1.7 kΩ?

The correct option is C 1 km Using R = ρLA, We get Length(L) = 1 km.

What length of a copper wire of cross-sectional are 0.01 mm², resistivity 1.7 × 10^–8 Ohm m, will be needed to prepare a resistance of 1.7 kΩ?

The correct option is C
1 km

Using R = ρ $\frac{L}{A}$ ,

We get Length(L) = 1 km.