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Transcript
Magnetic Force Guided Notes Name:____________________ Strength of Magnetic Force A charged particle moving in a magnetic field experiences a force that is __________________________to BOTH the ____________________ and to the _______________________ Lorenz Force Law The magnitude of the magnetic force on a moving, charged particle is (θ is the angle between the charge’s velocity and the magnetic field) Example: Sin 0, 180 = 0 If a charge has velocity in the same (or opposite) direction of the magnetic field, it experiences no force! Sin 90 = 1 A charge that has velocity perpendicular to the magnetic field experiences the greatest force! Question The three charges below have equal charge and speed, but are traveling in different directions in a uniform magnetic field. Which particle experiences the greatest magnetic force? Direction of Magnetic Force – the Right Hand Rule Point fingers in the direction in which __________________________ is moving Curve fingers in the direction of ____________________ Thumb points in the direction of the ______________________ IMPORTANT: The thumb points in the direction a POSITIVE charge (or current) would move. The force on a negative charge goes opposite the thumber. Right hand rule practice Magnetic Force Problems We do: What is the minimum magnetic field necessary to exert a 5.4 X 10-15 N force on an electron moving at 2.1 X 107 m/s? You do: What is the magnetic field necessary to exert a 5.4 X 10-15 N force on an electron moving at 2.1 X 107 m/s if the magnetic field is at 45 degrees from the electron’s velocity? What is the magnitude of the magnetic force on a proton moving at 2.5 X 105 m/s in a magnetic field of 0.5 T … (a) …if the velocity and magnetic field are at right angles? (b) … if the velocity and magnetic field are at 30°? (c) … if the velocity is parallel to a magnetic field? Comparison of Electric and Magnetic Fields