5. A thick wire carries current I and is surrounded by a thin metal tube carryin

Question

5. A thick wire carries current I and is surrounded by a thin metal tube carrying current I in the opposite direction. A vaccuum separates the conductors. Describe the magnetic field starting from the center.

a) Zero at center, increases steadily thru the thickness of the wire, stays constant in the void between the conductors, zero outside the outer wall of the tube.

b) Zero at center, increases steadily thru the thickness of the wire, increases in the void between the conductors, doubles immediately outside the outer wall of the tube , decreases as distance from the tube increases

c) Zero at center, increases steadily thru the thickness of the wire, decreases in the void between the conductors, zero outside the outer wall of the tube.

d) Maximum at center, decreases steadily thru the thickness of the wire, maximum in the opposite direction in the void between the conductors, zero outside the outer wall of the wire.

Explanation / Answer

Option B

because current I in opposite in direction so it produces Zero at center.

and it is nonzero outise the outer wall of the tube.

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