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Magnetic Forces Magnetic Field: SI Unit: 1Tesla (T) = 1N/Am Direction of Current Smaller magnetic force on current carrying wire into the page Direction of Current Small angle Direction of Magnetic Field. (shown lines of magnetic force) Largest magnetic force on current carrying wire into the page 900 Direction of Magnetic Field. (shown lines of magnetic force) Note: Unlike gravitational force or electric force, magnetic force is perpendicular to the plane formed by the field and the moving charge, and is greatest when the magnetic field and current are perpendicular to each other. The force on the current carrying wire shown above is therefore into the plane of the page and is determined by using the left-hand finger rule. . 1 G = 1 x 10-4 T Another unit for magnetic field is The magnetic field at the surface of the earth is about 0.5 G or 0.5 x 10 -4 T Strong electromagnets can produce fields on the order of 2 T and superconducting magnets over 10 T Magnetic Field can also be defined as Lines moving through unit surface area perpendicular to the field B = Number of Magnetic Field Lines Area perpendicular to field = Flux Area = /A 1 Wb = 1 T m2 Flux is measured in Example A synchrotron accelerates protons and uses a steering magnet to bend them into a curved path. Label the direction of the field on the diagram below which will cause the bend the beam downwards. + F v Magnetic Forces Practice 1. Find the direction of the magnetic force on the charges below X + _ v v _ B v 2. Find the direction of B for each case below. F + X v + v v X F _ F 3. What is the direction of the magnetic field at the position of the compass created by the wire? 4. What is the direction of the magnetic field at the position of the compass created by the coil? 5. What is the direction of the magnetic force acting on the wire as a result of the presence of the magnet? 6. Determine the direction of the magnetic force acting on wire number 1 7. Determine the direction of the magnetic field that will cause a beam of electrons to move in a counterclockwise circular path shown below. 8. Describe the direction of the magnetic force acting on the wire as a result of the magnetic field produced by the coil? 9. The end view of a coil of wire is shown. What is the direction of current flow in the coil that will create a magnetic field B directed in the plane of the page?