What diameter should you make a nichrome wire so its resistance is 0.013 Ω per meter...

Question

Question

What diameter should you make a nichrome wire so its resistance is 0.013 Ω per meter of length?

Express your answer to two significant figures and include the appropriate units.

science physics

Answer 1

Answer #1

formula for resitane of nichrome wire is

R = rho L/A

= rho L/ pi ( d/2)^2

R = rho L/ pi d^2/4

R = rho L 4/ pi d^2

d= sqrt 4 rho L/ pi R

= sqrt 4 ( 1.5 * 10^-6) (1 m)/ pi ( 0.013)

=1.21 cm or 1.2 * 10^-2 m

Answer 2

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