Magnetism

At what speed would a 0.2 m length of wire have to move across a 2.5 T magnetic field to induce an EMF of 10 V?

• 15 m/s

• 20 mph

• 2 m/s

• 20 m/s

An AC generator develops a maximum potential difference of 150 V. It delivers a maximum current of 30 A to an external circuit. What is the effective potential different of the generator?

• 14.15 V

• 106.05 V

• 21.21 V

• 100.15

A 20.0 m long wire moves perpendicularly through a magnetic field at 4.0 m/s. An EMF of 40 V is induced in the wire. What is the field's strength

• 0.5 T

• 200 T

• 50 A

• 0.9 T

If a magnetic field points east and the force points south, where does the velocity point?

• Up/Out

• Down/In

• North

• West

A doorbell requires an effective potential difference of 18 V from a 120 V line. If the primary coil has 475 turns, how many turns does the secondary coil have?

• 19 turns

• 4.5 turns

• 3200 turns

• 71.25 turns

A beam of electrons moves at right angles to a magnetic field of 0.006 T. The electrons have a velocity of 2.5x10^6 m/s What is the magnitude of the force on each electron

• 1.2*10^-15

• 2.4x10^-15

• 24000

• 1.2*10-4

If force points north and velocity points up where does the field point

• down

• south

• west

• east

Magnetic field lines point....

• South to North

• out of the north and south pole

• North to south

• into the north and south pole

If you cut a magnet in half....

• you break the magnet

• the poles reverse

• you create two magnets

• separates the north and south pole