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Bellwork

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.

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Bellwork

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  1. 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?

  2. 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.

  3. The force produced by a magnetic field on a charged particle depends on it’s velocity, it’s charge (+/-), andon 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)

  4. 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.

  5. 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?

  6. 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?

  7. Review • 1st RHR • Magnetic Field Lines • F = BIL • 2nd RHR • F = Bqv • 3rd RHR

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