Magnetism 4Electricity and Magnetism Related

Hans Christian OerstedDiscovered that an electric current causes a

magnetic field

How? Connected a series circuit

and turned on the power. A nearby compass moved!

This Proved there was an

electromagnetism link

Michael FaradayDiscovered that a magnetic field causes an electrical current.

How? Moved a wire through the magnetic field of a strong magnet. Found that an

electric current was produced in the wire.

ElectromagnetTemporary magnet made by wrapping a current

carrying wire around an iron core.

More coils = ____________

More current = ____________

More power

More power

GalvanometerMoving coil electric current detector.

The amount of deflection of a needle attached to the coil is proportional to the current passing through the coil.

GalvanometerThe accuracy of moving coil meters is dependent upon.….

Having a uniform and constant magnetic field