TOPIC 5 EM INDUCTION

5.2 Induced emf

When a conductor moves through a magnetic field, an __________________ is induced in the conductor.

electromotive force

How to increase induced emf?

increase the number of turns

Induced emf is _______________ to the rate of change of magnetic flux.

proportional

State Faraday’s Law

Induced emf is proportional to the rate of change of magnetic flux.

Which Hand Rule can be used to determine the direction of induced current?

Right Hand Rule

State one observation from Faraday’s experiment.

if bar magnet or coil is static, no induced current can be detected from galvanometer

What’s the SI unit for induced emf?

Volts (V)

To determine the direction of induced current in a straight conductor, we can use Right Hand Rule. First finger represent _______________________.

magnetic field

__________ law states that direction of induced current always flow in a direction that opposes the change of magnetic flux that cuases it.

Lenz’s

What’s the meaning of changing in magnetic flux?

relative motion between bar magnet and the coil