Magnitude of the magnetic field?

Question

If a current of 1.1 A is maintained in the loop, what is the magnitude of the magnetic field required to produce a tension of 0.039 N in the supporting string for a negligible gravitational force?

The gravitational force on loop is downward. A rectangular loop with dimensions (horizontal=.2m) x (vertical=.46m), is suspended by a string, and the lower horizontal section is immersed in a magnetic field.

This goes with the problem.

Answer 1

There's not enough info to solve this problem here.