Exercise 30.15 A metallic laboratory spring is typically 5.00 cmlong and 0.150 c
ID: 1378012 • Letter: E
Question
Exercise 30.15
A metallic laboratory spring is typically 5.00 cmlong and 0.150 cm in diameter and has 50 coils.
Part A
If you connect such a spring in an electric circuit, how much self-inductance must you include for it if you model it as an ideal solenoid?
Express your answer to three significant figures and include the appropriate units.
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Exercise 30.15
A metallic laboratory spring is typically 5.00 cmlong and 0.150 cm in diameter and has 50 coils.
Part A
If you connect such a spring in an electric circuit, how much self-inductance must you include for it if you model it as an ideal solenoid?
Express your answer to three significant figures and include the appropriate units.
L =SubmitMy AnswersGive Up
Explanation / Answer
N = 50 (no of loops)
A = area
A = pi*d^2/4
= pi*(0.15*10^-2)^2/4
= 1.767*10^-6 m^2
l = 0.05 m (length )
self inductnace, L = mue*N^2*A/l
= 4*pi*10^-7*50^2*1.767*10^-6/0.05
= 1.11*10^-7 H
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