Older televisions display a picture using a device called a cathode ray tube, where electrons are emitted at high speed and collide with a phosphorescent surface, causing light to be emitted. The paths of the electrons are altered by magnetic fields. Consider one such electron that is emitted with an initial velocity of 1.90 x 107 m/s in the horizontal direction when magnetic forces deflect the electron with a vertically upward acceleration of 5.50 x 1015 m/s². The phosphorescent screen is a horizontal distance of 7.2 cm away from the point where the electron is emitted. (a) How much time does the electron take to travel from the emission point to the screen? S (b) How far does the electron travel vertically before it hits the screen? cm

Older televisions display a picture using a device called a cathode ray tube, where electrons are emitted at high speed and collide with a phosphorescent surface, causing light to be emitted. The paths of the electrons are altered by magnetic fields. Consider one such electron that is emitted with an initial velocity of 1.90 x 107 m/s in the horizontal direction when magnetic forces deflect the electron with a vertically upward acceleration of 5.50 x 1015 m/s². The phosphorescent screen is a horizontal distance of 7.2 cm away from the point where the electron is emitted. (a) How much time does the electron take to travel from the emission point to the screen? S (b) How far does the electron travel vertically before it hits the screen? cm

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter26: Electromagnetism

Section: Chapter Questions

Problem 1STP

See similar textbooks

Similar questions

Suppose that a particle with mass m and electrical charge qmoves in the xy-plane under the influence of the magneticfield B = Bk (thus a uniform field parallel to the z-axis),so the force on the particle is F =qv x B if its velocity isv. Showthat the equations ofmotion of the particle are mx'' = +qBy' , my'' = -qBx'
In Bohr’s model of the H atom, an electron orbits a proton in a circle of radius 5.28 x 10-11 m with a speed of 2.18 x 106 m/s. What is the acceleration of the electron in this model?
A stone is fired from a slingshot straight up at an initial velocity magnitude of 25 m/s. Can the stone hit the bird (located at the line of path of the stone) that is resting on an electric line 30 m above the ground? Air resistance is neglected.
An electron, with an initial horizontal velocity of magnitude 4.57 × 109 cm/s, travels into the region between two horizontal metal plates that are electrically charged. In that region, it travels a horizontal distance of 2.25 cm and has a constant downward acceleration of magnitude 2.35 × 1017 cm/s2 due to the charged plates. Find (c) horizontal and (d) vertical velocity components of the electron as it emerges.
An electron in a magnetic field moves along a circle with a radius of 49.1 m with a speed that follows: v(t)=v0e−bt where b=0.67 s-1 and v0=447 m/s. Centripetal acceleration What is the centripetal component of the acceleration at t=3.1 s?
An electron is moving with an initial speed of 3.2 x 105 m/s toward a proton that is stationary. If the electron is very very far away from the proton initially, what distance from the proton does the electron have twice the speed it did originally?
The solar wind is a thin, hot gas given off by the sun. Charged particles in this gas enter the magnetic field of the earth and can experience a magnetic force. Suppose a charged particle traveling with a speed of 7.26 x 106 m/s encounters the earth's magnetic field at an altitude where the field has a magnitude of 1.75 x 10-7 T. Assuming that the particle's velocity is perpendicular to the magnetic field, find the radius of the circular path on which the particle would move if it were (a) an electron and (b) a proton.
A proton is shot horizontally near earth’s surface Find ⃗E necessary (magnitude and direction) to prevent the proton from falling towardthe earth as it flies. What would the flight of an electron look like under the same conditions. Give the electron’s acceleration - both magnitude and direction.
An electron, with an initial horizontal velocity of magnitude 2.44 × 109 cm/s, travels into the region between two horizontal metal plates that are electrically charged. In that region, it travels a horizontal distance of 2.18 cm and has a constant downward acceleration of magnitude 3.13 × 1017 cm/s2 due to the charged plates. Find (a) the time required by the electron to travel the 2.18 cm and (b) the vertical distance it travels during that time. Also find the magnitudes of the (c) horizontal and (d) vertical velocity components of the electron as it emerges.
(I) Determine the magnitude and direction of the forcebetween two parallel wires 25 m long and 4.0 cm apart,each carrying 25 A in the same direction
Which one of the following statements concerning the magnetic force on a charged particle in a magnetic field is true? A The magnetic force depends on the component of the particle's velocity that is perpendicular to the field. B The magnetic force is zero if the particle moves perpendicular to the field. C The magnetic force is a maximum if the particle is stationary. D The magnetic force is a maximum if the particle moves parallel to the field. E The magnetic force acts in the direction of motion for a positively charged particle.
1. A particle of 4.8 µC experiences a force ?⃗ = (3.2?̂− 2.5 ?̂) × 10−13 N when passing through a magnetic field ?⃗⃗ = (0.65 ?̂) ?. Compute the particle’s velocity.