Magnetism

Question 1

T/F: When a charge is placed in an electric field, the charge always experiences an electric force.

Answer 1

True

Question 2

T/F: A charge will always experience a magnetic force when placed in a magnetic field

Answer 2

False; 2 necessary conditions must be met

Question 3

what are the two necessary conditions for charge to experience a magnetic force?

Answer 3

1. charge must be moving

2. velocity of moving charge must have component that is perpendicular to the direction of the magnetic field

Question 4

An ______ produces a magnetic field.

Answer 4

electric current

Question 5

Equation: Magnetic Field

Answer 5

B = F / q(vsinø)
SI Unit: Nertonsecond / Coulomb*meter = Tesla (T)
Note: B = magnetic field; F=magnitude of the magnetic force on a positive test charge (q); v = velocity of the charge; ø = angle between the moving charge and the magnetic field

Question 6

The direction of the magnetic force (F) is ________ to both the velocity and the magnetic field.

Answer 6

perpendicular

Question 7

Equation: Magnitude of Magnetic Force that acts on a charge as it moves through a magnetic field

Answer 7

F = qvBsin(ø)
SI Unit: Newtons
Note: ø = angle between the moving charge and the magnetic field

Question 8

Right Hand Rule 1

Answer 8

Extend the R hand so the fingers point along the direction of the magnetic field B and the thumb points along the velocity (v) of the charge
-Palm of the hand faces in the direction of the magnetic force that acts on a positive charge

Question 9

A constant magnetic field does no _____ on a moving charged particle because magnetic force always acts perpendicular to motion of charge.

Answer 9

work

Question 10

T/F: A constant electric field does no work on a moving charged particle.

Answer 10

False. Unlike a magnetic field, a constant electric field will exert an electromotive force on a charged particle w/in the field.

Question 11

The magnetic field produced by a long, straight, current-carrying wire is _______ proportional to the circumference of the wire and _______ proportional to the current being carried through the wire.

Answer 11

Inversely to circumference

directly to current carried through wire (if I ^^ then B ^^)

Question 12

More current being carried through a wire will create a _______ magnetic field.

Answer 12

Larger

Question 13

The magnetic field produced at the center of a circular loop of current-carrying wire is _______ proportional to 2*radius of the circle

Answer 13

inversely

Question 14

What is ø if a magnetic field is directed parallel to the current in a long straight wire?

Answer 14

ø = 0
F = qvBsin(ø) = qvBsin(0) = 0 N