A current `-` carrying circular loop of radius `R` is placed in the `XY-` plane with centre at the origin. Half of the loop with `xgt0` is now bent so that is now lies in the `XY-` plane

Options

A. The magnitude of magnetic moment now diminishes
B. The magnetic moment does not change
C. The magnitude of `vec(B)` at `(0,0,z),z gt gt R` increeases
D. The magnitude of `vec(B)` at `(0,0,z),z gt gt R` is unchanged

Answer

1

Explanation

The magentic moment due to two halves haves of the bent circular loop are at right angle to each other. If `m` is the magnetic moment of the unbent loop, then that of the bent loop is
`sqrt((m//2)^(2)+(m//2)^(2))=m//sqrt(2) lt m`