Physics - Magnetism Question with Solution | TestHub

A square loop of side $L$ and mass $M$ is hinged about edge $AD$, and edge $BC$ is attached to a string so that the loop remains horizontal. A magnetic field $B$ is present along the $+x$-axis. A current flows along the path: $D\to A\to B\to C\to D$,

and the tension in the string becomes zero. If the direction of current is reversed (magnitude unchanged), the tension in the string becomes XMg then find the value of X ?