All magnets are always polarized. What does it mean to be polarized?
Magnets have two distinct ends, North and South.
100
This is a method to determine the direction of a magnetic field relative to the direction of conventional current in a wire.
What is the first right-hand rule.
100
(True or False) Force on a wire carrying current in a magnetic field is always at right angles to both the direction of the magnetic field and the direction of the current.
True.
100
What equation would you use to find the force on a single particle moving in a magnetic field?
What is F = qvB
100
The third right-hand rule is used for what type of particles?
What is positive particles. The left hand is used for negative particles.
200
These are vector quantities that exist in a region in space where a magnetic force occurs.
What is magnetic fields.
200
This is a long coil of wire consisting of many loops.
What is a solenoid.
200
In which direction, in relation to a magnetic field, would you run a current-carrying wire so that they force on it, resulting from the field, is minimized, or even made to be zero?
What is parallel to the magnetic field.
200
A wire that is 625 m long is perpendicular to a .40-T magnetic field. A 1.8-N force acts on the wire. What is the current in the wire?
What is 7.2 mA
200
For the "right-hand rule" when would you use your right hand and when would you use your left hand?
The right hand is used for conventional current and positively charged particle. You would only use the left hand to find the force on a negatively charged particle such as an electron.
300
If you broke a bar magnet in two, would you have isolated north and south poles? Explain.
No. Magnets are always polarize and will always have distinct North and South poles.
300
This type of magnet, which is created when current flows through a wire coil, is called an _________.
What is an electromagnet.
300
How much current will be required to produce a force of 0.38 N on a 10.0 cm length of wire at right angles to a 0.49-T field?
What is 7.8 A.
300
An electron passes through a magnetic field at right angles to the field at a velocity of 4.0x10^6 m/s. The strength of the magnetic field is 0.50-T. What is the magnitude of the force acting on the electron?
What is 3.2x10^-13 N
300
Which right-hand rule shows the direction of a force caused by a magnetic field?
What is the third right-hand rule.
400
This is the number of magnetic field lines passing through a surface.
What is magnetic flux.
400
This is a method you can use to determine the direction of the filed produced by an electromagnet relative to the flow of conventional current.
What is the second right-hand rule.
400
A 40.0-cm long copper wire carries a current of 6.0-A and weighs 0.35-N. A certain magnetic field is strong enough to balance the force of gravity on the wire. What is the strength of the magnetic field?
What is 0.15-T.
400
Imagine that a current-carrying wire is perpendicular to Earth's magnetic field and runs east-west. If the current is east, in which direction is the force on the wire.
What is up and away from the Earth's surface.
400
When using the second right-hand rule, the thumb points in the direction of which pole of the electromagnet?
What is the North pole.
500
Name the three most common magnetic elements.
What is Iron, Cobalt, and Nickel.
500
When the magnetic fields of the electrons in a group of neighboring atoms are all aligned in the same direction, the group is called a ________.
What is a domain.
500
Assume that a 19-cm length of wire is carrying a current perpendicular to a 4.1-T magnetic field and experiences a force of 7.6 mN. What is the current in the wire?
What is .01 A
500
A stream of doubly ionized particles (missing two electrons, and thus, carrying a net charge of two elementary charges) moves at a velocity of 3.0x10^4 m/s perpendicular to a magnetic field of 9.0x10^-2 T. What is the magnitude of the force acting on each ion?
What is 8.6x10^-16 N.
500
Provide three examples for the three uses of the right-hand rule.
1. Finding the direction of the magnetic field around a current-carrying wire.
2. Finding the north pole of an electromagnet.
3. Finding the force on either a current-carrying wire in a magnetic field or a charged particle in a magnetic field.