QUESTION 7 1 points Save Answer The next three questions lead you through creati

Question

QUESTION 7 1 points Save Answer The next three questions lead you through creating a solenoid out of copper wire with a radius of 0.25mm and a resistance of 6 . The resistivity of copper is 1.7e-8 W m. a. What length of wire will have the required resistance? (review chapter 27) QUESTION 8 1 points Save Answer b. One turn of wire uses a length of 2 r. If the radius of the solenoid is to be 1.00 cm, determine the number of turns of wire needed to use the whole length. QUESTION 9 1 points Save Answer C. Now that you know the number of turns, how long, in meters, should the solenoid be to provide a magnetic field of 05 T when using a current of 5A

Explanation / Answer

let L is the legnth of required wire.

a) use, R = rho*L/A

L = R*A/rho

= 6*pi*(0.25*10^-3)^2/(1.7*10^-8)

= 69.3 m

8) Number of trusn, N = L/(2*pi*r)

= 69.3/(2*pi*0.01)

= 1103 turns

9)

B = mue*N*I/l

==> l = mue*N*I/B

= 4*pi*10^-7*1103*5/0.05

= 0.139 m

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