the length of wire of diameter 0.5 mm needed to produce a coil of resistance `10Omega` and specific resistance `4.4xx10^(-7)Omega` m is

Question

the length of wire of diameter 0.5 mm needed to produce a coil of resistance `10Omega` and specific resistance `4.4xx10^(-7)Omega` m is

the length of wire of diameter 0.5 mm needed to produce a coil of resistance `10Omega` and specific resistance `4.4xx10^(-7)Omega` m is
A. 4.45 m
B. 5.55 m
C. 5.45 m
D. 1.45 m

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - A
`R= (rho l)/(A)`
`:.l=(10xx3.14xx25xx10^(-8))/(4.4xx10^(-7)xx4)=(78.5)/(17.6)=4.45`m

4 views Answered 2023-02-05 15:29