A magnetic field exerts no force on (1) an electric charge moving perpendicular to its direction (2) an unmagnetized iron bar (3) a stationary electric charge (4) a magnet

Answer: (3) a stationary electric charge

The area surrounding the magnet where the magnetic force is applied is the magnetic field. By using a compass needle, the position of the magnetic field lines at a location can be calculated. When it is located above the magnetic field, the needle of the compass is deflected. The north end of the compass shows the direction of magnetic field.

Moving charges can generate a magnetic field and encounter the magnetic field too. But the stationary charge from the other magnetic fields does not have the potential to produce or encounter magnetic fields. Since the moving charge generates the current that is accountable for the magnetic effects.

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