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10. A loop of copper is placed through two holes in a piece of paper. A current through the loop as shown forms a magnetic field. Which way do the field lines pass through the centre of the loop? Explain your answer. (2 marks) 11. A positive charge of 2.00 JC is moving at 3.00 m/s at an angle of 35.0 relative to a magnetic field of strength 4.20 uT. What is the magnetic force on the charge? (3 marks) 12. A proton is moving horizontally at 2.50 x 10 m/s through a magnetic field perpendicular to its motion that exerts an upward force on the proton, exactly balancing the downward force of gravity on the proton. What is the strength of the magnetic field