Please explain, thank you. l. A long, straight wire carries a current I. If the

Question

Please explain, thank you.

l. A long, straight wire carries a current I. If the magnetic field at a distance d from the wire has magnitude B, what is the magnitude of the magnetic field at a distance 2d from the wire? a) B/2 b) B/4 c) 2B 2. An overhead electric power line carries a current of 100 A. What is the magnitude of the maximum magnetic field at a point 5 m directly below the power line? 3. A wire is bent into the shape of a circle in the plane of the paper and carries a current that passes through the coil in a clockwise direction. What is the direction of the magnetic field at the center of the loop? a) to the right of the page b) into the plane of the paper c) to the left of the page d) out of the plane of the paper

Explanation / Answer

1. B = u0i/2pid

if d= doubled, i.e d' =2d

B' = B/2

option a.

2. B = 4pi*10^-7 * 100/(2pi*5)

B = 4 *10^-6 T

3. intom the plane of the papep

option b

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