Physics 2 Lab Final: Lab 8: Faraday's Law of Induction

What is the equation for magnetic flux?

Φ = BAcosθ

What are the units of magnetic flux?

Webers (Wb); 1 Wb = 1 T*m^2

When the magnetic field is perpendicular to the normal of the loop of wire, the angle is...

0 degrees

When the magnetic field is parallel to the normal of the loop the angle is

90 degrees

A changing magnetic flux will induce a current in the wire that will...

oppose the change in flux

clockwise

A magnet moves with its north pole facing up, the induced current will be __________ on the loop to oppose the change in flux created by the magnet

counterclockwise

A magnet moves with its south pole facing up, the induced current will be __________ on the loop to oppose the change in flux created by the magnet

According to Faraday's Law of Induction, the faster the magnet moves (greater the magnetic flux)

the more emf that is induced)

When the magnet is held stationary relative to the loop, what does the galvanometer needle do?

It does not deflect indicating there is no current induced and in this case no change in magnetic field enclosed by the loop and no induced emf around the loop.

The magnetic field lines are drawn so that the number of lines per unit area, the density of the field lines, is

proportional to the magnitude of the magnetic field, B. Where these lines are close together the magnitude of the magnetic field is large and where the lines are far apart the magnetic field is small

Faraday found that an induced emf appears only when...

the number of field lines through the loop is changing (a change in magnetic flux)

Faraday also found that the magnitude of emf is related to...

the rate at which the number of field lines changes, not the number of field lines at any given moment. The induced emf depends on the rate of change of magnetic field through the loop not on the field itself.

T or F: a weak magnet moved toward the loop quickly can induce an emf as great as a strong magnet being moved slowly toward the loop

true

What does theta represent when solving for magnetic flux?

the angle between the magnetic field and the normal to the loop

If a magnet is held stationary relative to the coil, how much emf is induced?

zero V

Magnetic field lines go from

go from north to south

In order for a weak magnet to induce the same emf as a strong magnet, what must the weak magnet do?

the weak magnet must move through the coil faster

The induced emf causes a current that ______ the change in flux

opposes

the magnetic field is _________ where the field lines are closest together

stronger