Extension in Spring due to Magnetic force!

The circuit in figure consists of wires at the top and bottom and identical metal springs as the left and right sides. The wire at the bottom has a mass of 10 g10 \text{ g} and is 5 cm5 \text{ cm} long. The wire is hanging as shown in the figure. The spring stretch 0.5 cm0.5 \text{ cm} under the weight of the wire and the circuit has a total resistance of 12Ω12 \Omega. When the lower wire is subjected to a static magnetic field, the springs stretch an additional 0.3 cm0.3 \text{ cm}. The magnetic field is?

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