(20%) Problem 4: An infinitely long wire carries a current of I= 155 A Randomize

Question

(20%) Problem 4: An infinitely long wire carries a current of I= 155 A Randomized Variables I-155 A Otheexpertta.com D 50% Part (a) Consider a circle with a radius r and centered on the wire. Determine the magnitude of the magnetic field B at points along the circle in terms of I andr p, × 50% Part (b) If r 0.085 m, calculate the numerical value of B in tesla B-3.64105 Grade Summary Deductions Potential 3% 97% Submissions cos0 cotan0 asin) acos0 atan)acotan) sinhO sin 78 9 HOME Attempts remaining: 9 % per attempt) detailed view 3% cotanhO 0 ENID Degrees Radians VOI BACKSPACE DELI CLEAR Submitn Feedback give up Hints: 1 % deduction per hint. Hints remaining: 1 Feedback: 0% deduction per feedback

Explanation / Answer

a) magnetic field due to a long wire, B = mue*I/(2*pi*r)

here mue ---> permeability of free space

I ---> current

r ---> distance from the wire

b)

B = 4*pi*10^-7*155/(2*pi*0.085)

= 3.65*10^-4 T

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