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?
Communication is effective because it allows individuals to share ideas, thoughts, and information with others.
effective communication can lead to improved outcomes in various settings, including personal relationships, business environments, and educational settings. By communicating effectively, individuals can negotiate effectively, solve problems collaboratively, and work towards common goals.
it starts up serve and return practice/assessments.it helps find voice talking therapy also assessments through relaxed conversation.
miss
Every time someone flushes a toilet in the apartment building, the person begins to jumb back automatically after hearing the flush, before the water temperature changes. Identify the types of learning, if it is classical conditioning identify the NS, UCS, CS and CR. If it is operant conditioning, identify the type of consequence positive reinforcement, negative reinforcement or punishment
nature is an hereditary factor while nurture is an environmental factor which constitute an individual personality. so if an individual's parent has a deviant behavior and was also brought up in an deviant environment, observation of the behavior and the inborn trait we make the individual deviant.
Samuel
I am taking this course because I am hoping that I could somehow learn more about my chosen field of interest and due to the fact that being a PsyD really ignites my passion as an individual the more I hope to learn about developing and literally explore the complexity of my critical thinking skills
hello. autism is a umbrella term. autistic kids have different disorder overlapping. for example. a kid may show symptoms of ADHD and also learning disabilities.
before treatment please make sure the kid doesn't have physical disabilities like hearing..vision..speech problem. sometimes these
Jharna
continue..
sometimes due to these physical problems..the diagnosis may be misdiagnosed.
treatment for autism.
well it depends on the severity.
since autistic kids have problems in communicating and adopting to the environment.. it's best to expose the child in situations where the child
Jharna
child interact with other kids under doc supervision.
play therapy.
speech therapy.
Engaging in different activities that activate most parts of the brain.. like drawing..painting. matching color board game.
string and beads game.
the more you interact with the child the more effective
Jharna
results you'll get..
please consult a therapist to know what suits best on your child.
and last as a parent. I know sometimes it's overwhelming to guide a special kid.
but trust the process and be strong and patient as a parent.
Jharna
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