Download Left hand rule - DrBravophysics

Starter:
Suggest one practical idea to reduce the
amount of noise transmitted into a flat
through the walls and explain how your
idea will work (2marks)
• line / panel the walls with wood
/ plasterboard / increase the thickness of
the plaster (on the walls) (1)
• (this) will absorb / reflect (back) (most /
some of) the sound (1)
25-May-17
The motor effect
 Explain the motor effect.
 State three ways of increasing the
motor effect.
 Design a loudspeaker.
an electric current in a magnetic field
25-May-17
an electric current in a magnetic field
25-May-17
demonstration
25-May-17
magnetic field lines
25-May-17
factors affecting the force
25-May-17
25-May-17
When a current is passed along a wire
in a magnetic field, a force may be
exerted on the wire
25-May-17
In the motor effect, the force is increased
by:
 Increasing the current.
 Increasing the field.
 Placing the wire perpendicular to the
magnetic field.
25-May-17
The direction of the force is reversed
if either the direction of the current or
the direction of the magnetic field is
reversed.
25-May-17
25-May-17
How does a loudspeaker work?
clip
25-May-17
Task:
Workbook page 128, Q1-4