Calculate the length of a constantan wire of cross- sectional area 4 π x 10^-8m² and resistivity 1.1 x 10^-6 Ω m required to construct a standard resistor of resistance 21 Ω. [Take π = 22/7]

0.42m

2.40 m

6.25 m

183.75 m

590.00 m

Correct Option

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1 year ago

might be helpful

11 years ago

its c na

12 years ago

21 x 4 x 3.143 x 0.000000010/1.1 x 0.0000010

= 2.400

11 years ago

benita:it is d

ceoofwahala

20th June, 2026

Chemistry

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ASSAAS

20th June, 2026

English Language

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infinitehoaxx

21st May, 2026

Computer

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Calculate the length of a constantan wire of cross- sectional area 4 π x 10-8m2 and resistivity 1.1 x 10-6 Ω m required to construct a standard resistor of resistance 21 Ω. [Take π = 22/7]