Magnetic Fields and Forces

Question 1

Magnetic field lines point from ______ to _____

Answer 1

North to South

Question 2

First RHR

Answer 2

Point right thumb in direction if the current, and your fingers curl around in the direction of the magnetic field produced by that current

Question 3

Second RHR

Answer 3

Place fingers in the direction of the magnetic field with thumb in the direction of the current in the wire. The magnetic force on the wire will come out of your palm.

Question 4

Force on a current-carrying wire equation

Answer 4

F = ILBsin(theta), where I is the current in the wire, L is the length of wire in the magnetic field, B is the magnetic field, and theta is the angle between the length of the wire and the magnetic field.

Question 5

Force on a charge moving through a magnetic field equation:

Answer 5

F = qvBsin(theta), where q is the charge in Coulombs, v is the velocity in m/s, B is the magnetic field in Teslas, and theta is the angle between the velocity and the magnetic field.

Question 6

Moving a magnet through a coil of wire and generating a current is called:

Answer 6

electromagnetic induction

Question 7

To increase the amount of voltage induced in a coil of wire…?

Answer 7

a. move the magnet faster through the coil, b. move a stronger magnet through the coils of wire, c. move the magnet through more coils of wire, d. move more coils of wire around a magnet, e. move more magnets simultaneously through a coil of wire

Question 8

Domain

Answer 8

when all the domains of a magnetic substance are aligned, the substance becomes a fixed magnet with a set magnetic field

Question 9

Magnitude of the Magnetic Field of a Wire

Answer 9

B = mucurrent/(2pir) where mu is the permeability of free space = 4pi * 10^-7, r is the distance measured from the center of the wire to the point where the field is to be solved. Measured in Teslas

Question 10

If a charge, q, enters a uniform magnetic field, B, at speed v, what is the radius of the circular path?

Answer 10

mv^2/r = qvB