Q

# Need clarity, kindly explain! - Magnetic Effects of Current and Magnetism - JEE Main-2

A current $I$ flows along the length of an infinitely long, straight, thin walled pipe. Then

• Option 1)

the magnetic field at all points inside the pipe is the same, but not zero

• Option 2)

the magnetic field is zero only on the axis of the pipe

• Option 3)

the magnetic field is different at different points inside the pipe

• Option 4)

the magnetic field at any point inside the pipe is zero

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As we learnt in

Ampere's Law -

Total Current crossing the above area is $\left ( i_{1}+i_{2}-i_{3} \right )$

- wherein

Outward postive  $\bigodot$

Inward negative X

Magnetic field is shielded and no current is inside the pipe to apply Ampère’s law. (Compare to electric field inside a hollow sphere).

Option 1)

the magnetic field at all points inside the pipe is the same, but not zero

Incorrect option

Option 2)

the magnetic field is zero only on the axis of the pipe

Incorrect option

Option 3)

the magnetic field is different at different points inside the pipe

Incorrect option

Option 4)

the magnetic field at any point inside the pipe is zero

Correct option

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