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What experiences forces in fields?
Any charged object experiences a force in an electric field
A moving charged object experiences a force in a magnetic field
When can Earth’s electric and magnetic fields be modelled as uniform?
Over small distances
How do we create a uniform electric field?
By placing two parallel plates with equal and opposite charges close to each other
How do we create a uniform magnetic field?
By using a solenoid or a series of magnets arranged properly
What is Earth’s electric field like in fine weather?
It points downwards with a strength of around 100V/m
What is Earth’s electric field like in stormy weather?
It points upwards and can be very strong
How do electric field lines show an electric field?
They indicate direction of the field (positive to negative)
They show strength (density of field lines)
What is potential difference?
The difference in electrical potential (voltage) between the two plates
Equation for electrical field strength?
E = ∆V / d
Electric Field Definition:
Electrostatic force per unit charge exerted on a small positive test sample
Equation for electrostatic force?
F = q x E
How do we relate acceleration of a charged particle in an electric field to Newton’s second law?
F = qE, however F = ma according to Newton’s second law
Therefore we can say that a = qE/m
Acceleration can also be written as a = F/m as well as a = qE/m, linking electric force and acceleration.
What are the components of the right hand rule?
Thumb = Direction of flow of positive charge/ direction of flow of the field.
Fingers = Direction of the magnetic field positive to negative (palm to tips)
Palm = Direction of force
How is work done related to kinetic energy?
Work done = Kinetic Energy gained
How does a particle experience a force in a magnetic field?
If a charged particle moves through a magnetic field and a component of its velocity is perpendicular to the magnetic field, it will experience a force.
What is the nature of the force experienced by a charged, moving particle in a magnetic field?
This force that is experienced, will always be perpendicular to the magnetic field, and perpendicular to the velocity.
When does a particle not experience a force in a magnetic field?
When it is uncharged or stationary, or when the angle o
Which plate has a higher electrical potential?
The positive plate has a higher electrical potential.
This is because the field does work ( W=qV) on the positive plate.
Equation for work done?
W=qV
