Unit 3 Flashcards
What is electromagnetic induction?
The production of an electromagnetic force across an electrical conductor in a changing magnetic field.
Define electric field strength.
Electric field strength is an expression of the intensity of the electric field at a particular location.
What is centripetal acceleration?
It is acceleration that goes into the circle (along the radius)
What is the difference between period and frequency?
Period is the time taken for one rotation whereas frequency is how many rotations occur in a second.
Define the term gravitational field.
The region of space aurrounding a body in which another body experiences a force of gravitational attraction.
Recall Keplers laws of planetary motion.
- All planets move around the sun in elliptical orbits.
- A line joining the sun and a planet sweeps in equal areas at equal times.
- T^2=r^3
Define electrical potential energy.
The energy needed to move a charge against an electric field.
Identify the direction the normal force acts.
The normal force always acts at right angles to the surface the object is resting upon.
What is normal force?
It is the force acting on an object on a surface due to the surface itself pushing back on an object.
What is work?
Work is a change in energy.
Define magnetic flux density.
The ammount of magnetic flux in an area taken perpendicular to the magnetic flux’s direction.
Define magnetic flux.
Defined as the number of magnetic field lines passing through a given closed surface. It provides the measurement of the total magnetic field that passes through a given surface area.
Define a solenoid:
A solenoid is a type of electromagnet, the purpose is to generate a controlled magnetic field through a coil.
List three ways you could increase the strength of an electromagnet.
- Wrapping a coil around a piece of iron.
- Adding more coils.
- Increasing the current.
