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Grade 11 Physics Alternate E-Day Project - Electrodynamics

Last updated 10 months ago
10 questions
Note from the author:
This coursework will introduce you to Electrodynamics.
We will start off with Fields, specifically magnetic and electric fields and then move on to electrodynamics and finally see how a DC Motor functions.
Watch the relevant videos and answer the questions that follow.
Please ensure you have your Physics Textbook with you.
This coursework will introduce you to Electrodynamics.
We will start off with Fields, specifically magnetic and electric fields and then move on to electrodynamics and finally see how a DC Motor functions.
Watch the relevant videos and answer the questions that follow.
Please ensure you have your Physics Textbook with you.
The magnetic field and electric current
Scan the QR Code. Password (it is case sensitive) is found inside cover of your textbook.
In the Prezi menu click on Electromagnetism. Read through this presentation and answer the questions that follow.
Link: https://new-acc-space-11067.ispring.com/app/preview/59af6f06-31d9-11ed-a64f-9e340ccbc212
1

What must charge do in order to produce a magnetic field?

1

What type of field surrounds a straight current carrying conductor?

1

Draw the field around the current carrying conductor and include its direction by means of arrows

3

A cross-section of a current carrying conductor is shown.
Choose the statements that apply:

2

The following shows the flow of conventional current through the coils. Indicate on the diagram the North and South Poles as well as the direction of the current through the coils.
Use any colour other than black.

The Motor Effect
Return to your original prezi menu and click on
the motor effect.
https://new-acc-space-11067.ispring.com/app/preview/59af6f06-31d9-11ed-a64f-9e340ccbc212
Watch the video on d.c. motors to help you understand how a current carrying conductor can experience a force.
3

Explain how we can increase the Force acting on a wire according to the following diagram.

Increase
Decrease
Current in wire passing through magnetic Field
Length of conductor in magnetic field
Magnetic field strength
2

The best angle between the current in the wire and magnetic field, to experience maximum force is? (you may make more than one selection)

The following image explains why the force exerted on the current carrying conductor exists and also in which direction it is exerted.
Fleming's left hand rule allows us to determine the direction of the force on the wire. Study the rule in the diagram below.
Flemming’s left hand rule
Hold the thumb, first finger and second finger of the left hand at right-angles to each other. Align the second finger with the direction of the current in the conductor. The first finger points in the direction of the external magnetic field.
The thumb points in the direction of the magnetic force or thrust experienced by the conductor and this is the direction that the conductor will move.
Watch the video to see how the split-ring commutator aids the continuous rotation of the armature.
8

Arrange the following choices in the correct sequence in order to explain how a simple d.c. motor works

  1. which reverses the forces on acting on the coil
  2. which keeps the coil spinning in one direction
  3. one side will experience a force downward and the other side will experience a force upwards
  4. d.c. current passes through the coil
  5. the current creates a magnetic field around the coil
  6. the magnetic field interacts with the field of the magnet causing a force to be exerted on the coil
  7. the split ring reverses the direction of the current in the coil every half turn.
  8. the armature rotates
1

Predict which direction the armature would spin.

1

Describe the motion of the armature if the battery was connected directly without an a split ring commutator.