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(25 pts) A slender metal bar, measuring 0.6 meters in length and weighing 0.20 kg, is propped up against two metal brackets within a consistent 2.0 T magnetic field, as depicted in the diagram provided. The bar remains suspended due to the magnetic force acting upon it, though it isn't fixed to the supports. Additionally, a circuit comprising a battery and a resistor with a resistance of 10.0 2 is linked to these supports in series. R |+ A F; \\ X X, A\\ '.:-')g 7 (a) (5 pts) Which circuit has the correct battery polarity to generate a current that would hold up the wire? Explain your answer. (b) (10 pts) What is the lowest voltage the battery can have without the wire falling? () (10 pts) Draw the net magnetic field of the permanent magnets for the two scenarios shown below. Be sure to draw enough field lines such that your answer is clear in all regions