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The horizontal scale represents the x-axis, in nanometer, from 0 to 13 in an increment of 1. The vertical scale represents the y-axis, in nanometer, from 0 to 12 in an increment of 1. The charges negative 4.04, the positive 5.0, and the negative 2.35 have spherical directions of magnetic fields.

The input value is as follow:

Line source equals 5.0 amperes

A radio button is on that reads place line source.

A radio button is off that reads change current value.

A radio button is off that reads remove line source.

A radio button is off that reads move line source.

A radio button is off that reads show magnetic field.

At cursor:

B equals blank space amperes per meter