Question bank/JEE Main/Physics

Two concentric rings of radius r and R are in same plane such
that R >> r. Current Ι is maintained in thering of radius r. Flux
associated to the ring of radius R due to this current is (use proper
approximation).

A$\frac{\pi\mu_{0}{Ir}^{2}}{2R}$B$\frac{\pi\mu_{0}Ir}{2}$C$\frac{\pi\mu_{0}{IR}^{2}}{2r}$D$\frac{\pi\mu_{0}IR}{2}$

Show answer and solution▾

If current I is maintained in ring of radius R the flux
associated with ring of radius r will be:$\frac{\pi\mu_{0}{Ir}^{2}}{2R}$
[IMAGE] Since M_12 = M_21 so same flux would be associated to the ring of
radius R if I is maintained in ring ofradius r.

Source: Grass-G / P-13 Physics paper 4 Nov.docx