Constants Part A The magnetic field B at the center of a circular coil of wire c

Question

Constants Part A The magnetic field B at the center of a circular coil of wire carrying a current I, as in (Figure 1), is Roughly estimate the current this loop would carry Express your answer to one significant figure and include the appropriate units where N is the number of loops in the coil and r is ts radius. Imagine a simple model in which the Earth's magnetic field of about 1 G( 1x 104 T) near the poles is produced by a single current loop around the is the number of loops in the coil and T is its IValue Units Submit Request Answer Figure 1 of 1>

Explanation / Answer

for single loop, N = 1

so B = u0 I / (2 r)

(for earth, r = Re = 6.37 x 10^6 m )

(1 x 10^-4) = (4pi x 10^-7)(I) / (2 x 6.37 x 10^6)

I = 1 x 10^9 A

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