Wednesday Homework Problem 10.1 The right figure to the shows the cross-section

Question

Wednesday Homework Problem 10.1 The right figure to the shows the cross-section of a wire in gray. The wire carries a current I uniformly distributed over the cross-section. Rank the path 3 currents encircled, I, by the three ian paths (dashed lines) Amper path 2 drawn Select One of the Following Wire (c) I path l Wednesday Homework Problem 10.2 An infinite straight wire of radius d carries a 1 uniformly dis- current tributed over its cross section. At what radius, r, is the magnetic field maximum? Select One of the Following (a) at the center of the wire, 0 (b) at the edge of the wire, d (c) at some radius outside the wire, r d (d) at infinity

Explanation / Answer

10.1: Greater the area, Greater will be current.

(d) I1 < I3 < I2

10.2: inside the wire,

B( 2 pi r) = u0 (I r^2 / d^2)

B = u0 I r / (2 pi d^2 )

so B will max at r = d

Ans(b)

10.3 : (B) path b

10.4: B (2 pi r) = u0 Iin

for region III, I_in = 1 - 4 + 3 = 0

Ans: (A) field is zero.

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