PHYSC MISC LAB 9
ELECTROMAGNETIC
INDUCTION
, PHYSC MISC LAB 9
ELECTROMAGNETIC
INDUCTION
1. Objective
The aim of this experiment is to learn how a permanent magnet, a moving coil
with a constant current, and a constant coil with a changing current, change the
induced voltage in a coil.
2. Description
The apparatus used in this lab includes Capstone, RLC circuit board, box with 2
coils that has iron rod and a cylindrical magnet, 1 voltage sensors, 2 leads (120
cm.), and 1 lead (150-200 cm). In this experiment an emf was induced in one coil
by moving a permanent magnet into and out of the coil, moving a second coil,
which has a current, near the first coil, and changing the current in the second coil.
Most of the results were be qualitative. The strength of the induced emf depends on
the rate of change of the magnetic field. When an emf is induced in a coil the
current that results will depend on the resistance of the circuit which the coil is part
of. A voltage will also appear across the coil which was measured by a voltmeter.
3. Theory
The changing magnetic field produces an electric field which is not conservative.
The line integral of the electric field around a loop or circuit is not zero and is
called an electromotive force or EMF. The EMF can drive a current in a circuit.
The unit of EMF is the volt (V). The flux Φ of the magnetic field is defined in a
similar way to the flux of the electric field. A magnetic field vector ⃗B passes
through a differential area d ⃗A . The differential element of magnetic
flux associated with d ⃗A is dΦ = ⃗B · d ⃗A . It
is only the component of ⃗B that is
perpendicular to the surface area that contributes to the flux. For a finite area the
magnetic flux is
ELECTROMAGNETIC
INDUCTION
, PHYSC MISC LAB 9
ELECTROMAGNETIC
INDUCTION
1. Objective
The aim of this experiment is to learn how a permanent magnet, a moving coil
with a constant current, and a constant coil with a changing current, change the
induced voltage in a coil.
2. Description
The apparatus used in this lab includes Capstone, RLC circuit board, box with 2
coils that has iron rod and a cylindrical magnet, 1 voltage sensors, 2 leads (120
cm.), and 1 lead (150-200 cm). In this experiment an emf was induced in one coil
by moving a permanent magnet into and out of the coil, moving a second coil,
which has a current, near the first coil, and changing the current in the second coil.
Most of the results were be qualitative. The strength of the induced emf depends on
the rate of change of the magnetic field. When an emf is induced in a coil the
current that results will depend on the resistance of the circuit which the coil is part
of. A voltage will also appear across the coil which was measured by a voltmeter.
3. Theory
The changing magnetic field produces an electric field which is not conservative.
The line integral of the electric field around a loop or circuit is not zero and is
called an electromotive force or EMF. The EMF can drive a current in a circuit.
The unit of EMF is the volt (V). The flux Φ of the magnetic field is defined in a
similar way to the flux of the electric field. A magnetic field vector ⃗B passes
through a differential area d ⃗A . The differential element of magnetic
flux associated with d ⃗A is dΦ = ⃗B · d ⃗A . It
is only the component of ⃗B that is
perpendicular to the surface area that contributes to the flux. For a finite area the
magnetic flux is
