When a charged particle moves through a magnetic field it
experiences a force. For a particle that is moving at right anglesto the magnetic field, the force is given by:
where
is the charge on the particle,
is the velocity of the particle and
is the magnetic field
through which the particle is moving. Thsi force is called the Lorentz force.
An electron travels at
at right angles to a magnetic field of 80 000 T. What force is exerted on the electron?
We are required to determine the force on a moving charge in a magnetic field
The direction of the force exerted on a charged particle moving
through a magnetic field is determined by using the Right HandRule.
Point your first finger (index finger) in the direction of the velocity of the charge, your second finger (middle finger) in the direction of the magnetic field and then your thumb will point in the direction of
the force exerted on the charge. If the charge is negative, the direction of the forcewill be opposite to the direction of your thumb.
Real-world applications
The following devices use the movement of charge in a magnetic field
old televisions (cathode ray tubes)
oscilloscope
Research project : real-life applications of charges moving in a magnetic field
Choose one of the following devices and do some research on the internet or in a library how your device works.
oscilloscope
television
Lorentz force
What happens to a charged particle when it moves through a magnetic field?
Explain how you would use the Right Hand Rule to determine the direction of the force experienced by a charged particle as it moves in a magnetic field.
Summary
Electromagnetism is the study of the properties and relationship between electric currents and magnetism.
A current-carrying conductor will produce a magnetic field around the conductor.
The direction of the magnetic field is found by using the Right Hand Rule.
Electromagnets are temporary magnets formed by current-carrying conductors.
Electromagnetic induction occurs when a changing magnetic field induces a voltage in a current-carrying conductor.
Transformers use electromagnetic induction to alter the voltage.
A moving charged particle will experience a force in a magnetic field.
End of chapter exercises
State the Right Hand Rule to determine the direction of a magnetic field around a current carrying wire and the Right Hand Rule to determine the direction of the force experienced by a moving charged particle in a magnetic field.
What did Hans Oersted discover about the relationship between electricity and magnetism?
List two uses of electromagnetism.
Draw a labelled diagram of an electromagnet and show the poles of the electromagnet on your sketch.
Transformers are useful electrical devices.
What is a transformer?
Draw a sketch of a step-down transformer.
What is the difference between a step-down and step-up transformer?
When would you use a step-up transformer?
Calculate the voltage on the secondary coil of a transformer if the voltage on the primary coil is 22 000 V and the ratio of primary windings to secondary windings is 500:1.
You find a transformer with 1000 windings on the primary coil and 200 windinds on the secondary coil.
What type of transformer is it?
What will be the voltage on the secondary coil if the voltage on the primary coil is 400 V?
An electron moving horizontally in a TV tube enters a region where there is a uniform magnetic field. This causes the electron to move along the path (shown by the solid line) because the magnetic field exerts a constant force on it. What is the direction of this magnetic field?
upwards (towards the top of the page)
downwards (towards the bottom of the page)
into the page
out of the page
Questions & Answers
A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance
Chemistry is a branch of science that deals with the study of matter,it composition,it structure and the changes it undergoes
Adjei
please, I'm a physics student and I need help in physics
Adjanou
chemistry could also be understood like the sexual attraction/repulsion of the male and female elements. the reaction varies depending on the energy differences of each given gender. + masculine -female.
Pedro
A ball is thrown straight up.it passes a 2.0m high window 7.50 m off the ground on it path up and takes 1.30 s to go past the window.what was the ball initial velocity
2. A sled plus passenger with total mass 50 kg is pulled 20 m across the snow (0.20) at constant velocity by a force directed 25° above the horizontal. Calculate (a) the work of the applied force, (b) the work of friction, and (c) the total work.
you have been hired as an espert witness in a court case involving an automobile accident. the accident involved car A of mass 1500kg which crashed into stationary car B of mass 1100kg. the driver of car A applied his brakes 15 m before he skidded and crashed into car B. after the collision, car A s
can someone explain to me, an ignorant high school student, why the trend of the graph doesn't follow the fact that the higher frequency a sound wave is, the more power it is, hence, making me think the phons output would follow this general trend?
Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
Joseph
"Generation of electrical energy from sound energy | IEEE Conference Publication | IEEE Xplore" ***ieeexplore.ieee.org/document/7150687?reload=true
A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?
