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UESTION 2 State two examples of magnetic field sources. (2 marks) b) A 1.0 m straight wire carries 7.0 A of current in a uniform magnetic field of 3.5 x 10* T. The long straight wire makes an angle of 40" to the magnetic field. Calculate the force exerted on the wire. (2 marks) c) A proton is moving in a circular orbit perpendicular to a magnetic field. Given the mass and angular velocity of the proton are 1.67 x 10"kg and 1.88 x 10" rad/s, respectively. Determine the magnitude of the magnetic field