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The circuit in figure consists of wires at the top and bottom and identical metal springs at the left and right sides. The wire at the bottom has a mass of \( 10.0 \mathrm{~g} \) and is \( 5.00 \mathrm{~cm} \) long. The wire is hanging as shown in the figure. The springs stretch \( 0.500 \mathrm{~cm} \) under the weight of the wire, and the circuit has a total resistance of \( 12.0 \Omega \). When a magnetic
field is turned on, the springs
stretch an additional \( 0.300 \mathrm{~cm} \).
The magnitude of magnetic field is
(1) \( 1.2 \mathrm{~T} \)
(2) \( 6 \mathrm{~T} \)
(3) \( 0.6 \mathrm{~T} \)
(4) \( 12 \mathrm{~T} \)
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