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Transcript

Bellwork A wire carrying a current of 3.0 A is in a uniform magnetic field. The wire makes an angle of 15° with the field. The wire is 35 cm in length and the force on the wire is 0.80 N. What is the strength of the magnetic field? Force on a Charged Particle • Charged particles are not confined to a wire. • Cathode-ray tube in monitors and TVs use magnetic fields to deflect electrons to form pictures on the screen. • The screen in coated with phosphor to glow when an electron hits it. • The force produced by a magnetic field on a charged particle depends on it’s velocity, it’s charge (+/-), and on the strength of the field. • Direction of force is perpendicular to both the velocity of the particle and the B-field. • F= Bqv • B- magnetic field (T) • q- charge of particle (C) (no negatives) • v- velocity of particle (m/s) To determine directions: • • • • Use the 2nd RHR: Thumb point in the direction of the velocity Fingers faces the direction of the field Your palm points to the direction of the force on a POSITIVE particle. It will be opposite for a NEGATIVE particle. Practice • A proton travels at 3.0 x 106 m/s to the west through a uniform magnetic field of 0.04 T toward the north. What is the force on the proton? • An electron travels at 2.7 x 105 m/s to the west through a uniform magnetic field of 0.07 T toward the north. What is the force on the electron? Review • • • • • • 1st RHR Magnetic Field Lines F = BIL 2nd RHR F = Bqv 3rd RHR