Question

A single current-carrying loop of wire carrying current I flows in the anticlockwise direction (seen from the +z direction) and lies in the xy plane. The plot of \(\hat{j}\) component of magnetic field (\(B_y\)) at a distance a (less than radius of the coil) and on the yz plane vs z coordinate looks like:

• A.

  

• B.

  

• C.

  

• D.

  

Hint:

For magnetic field due to current loops:
• Use the right-hand rule to determine the direction of the field.
• Symmetry plays a critical role in analyzing magnetic field variations.

Answer 1

The Correct Option is A

- At z = 0 (plane of the loop), B_y = 0. - B_y is opposite in sign for +z and -z, as per the right-hand rule.

B_y = 0 in plane of coil B_y is opposite of each other in -z and +z positions.