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Most Essential Learning Competency
Evaluate the magnetic field vector at any point along the axis of a circular current loop (STEM_GP12EMIIIi-64)
Electromagnetic induction describes how a change in the magnetic field within a closed loop of wire induces an electromotive force (EMF) in the wire. This induced EMF can cause an electric current to flow in the wire, which is known as an induced current. When the wire is carrying an electric current, it means there are charged particles (electrons) moving along the wire. When these moving charges are in a magnetic field, they experience a force. This force is known as the Lorentz force.
The Lorentz force is perpendicular to both the velocity of the charges (which is along the wire and defines the direction of the current) and the magnetic field. The direction of the force follows the right-hand rule. If you point your thumb in the direction of the current and your fingers in the direction of the magnetic field, your palm will point in the direction of the force.
Group Activity/Discussion/Presentation
Construct your own homopolar motor using available materials (i.e. batteries, neodymium magnets, copper wire). What causes the homopolar motor to spin?
Observe the motor's motion. In which direction does it spin- clockwise or counterclockwise?
Reconfigure the setup so that the motor spins in the opposite direction. How were you able to reverse the direction of the spin of the motor?
Illustrate the setup complete with labels indicating the direction of the force, current, and magnetic field.
A representative will be called randomly to present the setup and the illustration.
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