A steady current I flows down a hollow cylindrical tube of radius $a$ and is uniformly distributed around the tube. Let $r$ be the distance from the axis of symmetry of the tube to a given point. What is the magnetic field $B$ at a point inside the tube?

0

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2

\frac{I}{r c}

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2

I R / a c

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4 π

(r - a) I / r

^{2}

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Solution

The correct option is A $0$
Since $i_{e n c l o s e d} = 0$ ,
$\to B$ is zero inside the tube.

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A steady current I flows down a hollow cylindrical tube of radius a and is uniformly distributed around the tube. Let r be the distance from the axis of symmetry of the tube to a given point. What is the magnetic field B at a point inside the tube?

The correct option is A 0Since ienclosed=0, →B is zero inside the tube.

A steady current I flows down a hollow cylindrical tube of radius $a$ and is uniformly distributed around the tube. Let $r$ be the distance from the axis of symmetry of the tube to a given point. What is the magnetic field $B$ at a point inside the tube?

The correct option is A $0$
Since $i_{e n c l o s e d} = 0$ ,
$\to B$ is zero inside the tube.