The circuit shown in Figure. uses two identical springs to support a 10-cm-long horizontal...

The circuit shown in Figure. uses two identical springs to support a 10-cm-long horizontal wire with a mass of 20 g. In the absence of a magnetic field, the weight of the wire causes the springs to stretch a distance of 0.2 cm each. When a uniform magnetic field is turned on in the region containing the horizontal wire, the springs are observed to stretch an additional 0.5 cm each. What is the intensity of the magnetic flux density B? The force equation for a spring is F = kd, where k is the spring constant and d is the distance it has been stretched.

FIGURE : Configuration of Problem .