(8%) Problem 9: An infinitely long wire carries a current of I 125 A. Randomized

Question

(8%) Problem 9: An infinitely long wire carries a current of I 125 A. Randomized Variables 125 A A 50% Part (a) Consider a circle with a radius r and centered on the wire. Determine the magnitude of the magnetic field Bat points along the circle in terms of I and r Grade Summary Deductions 0% Potential 100% Submissions Attempts remaining: 3 30% per attempt) 4 5 6 detailed view 1 2 3 BACKSPACE Submit Hint I give up! Hints 30% deduction per hint. Hints remaining 2 Feedback 30% deduction per feedback. A 50% Part (b) If r 0.045 m, calculate the numerical value of B in tesla

Explanation / Answer

a) B = mue*I/(2*pi*r)

b) at r = 0.045 m

B = mue*I/(2*pi*r)

= 4*pi*10^-7*125/(2*pi*0.045)

= 5.56*10^-4 T

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