University:
Amherst College
Course:
PHYS 117 | Introductory Physics II: Electromagnetism and Optics
Academic year:

2023
Views:

236

Pages:

15
Author:

KNISLEKSZED4go

Magnetic field intensity is highest at the poles and lowest near the equator The magnetic field is vertical at the poles and horizontal at the equator Magnetic field of a dipole magnet N S Earth’s magnetic field approximates an axial geocentric dipole Since 1500 Secular variation: the magnetic field of Earth changes over time intensity has declined and tilt has increased Magnetic N pole has migrated over time Rapid on a human timescale …on a geological timescale? Paleomagnetism (fossil magnetization) is recorded in rocks Curie temperature: change from ferromagnetic to paramagnetic PALEOMAGNETISM (past magnetizations) are recorded in volcanic rocks The magnetic field has reversed polarity in the past There have been >20 polarity reversals in the past 5 million years Earth’s magnetic field: what we know •The field approximates a magnetic dipole •The field is continuously varying •The field reverses polarity, on average every ~1/4 million years Magnetic fields causes: •permanent ferromagnets iron Magnetite hematite •electromagnets Disc dynamo external magnetic field Self generating dynamo electromagnet A conductor moving through an external magnetic field creates an electrical current Current flowing through a coiled conductor creates a magnetic field Magnetic field generated by spiral motions in the outer core Magnetic field simulation blue: directed out of the core gold: directed into the core model magnetic field observed magnetic field

Magnetic Field Intensity is Highest at the Poles

Magnetic Field Intensity is Highest at the Poles - Page 3

Magnetic Field Intensity is Highest at the Poles - Page 4

Magnetic Field Intensity is Highest at the Poles - Page 5

Magnetic Field Intensity is Highest at the Poles - Page 6

Magnetic Field Intensity is Highest at the Poles - Page 7

Magnetic Field Intensity is Highest at the Poles - Page 8

Magnetic Field Intensity is Highest at the Poles - Page 9

Magnetic Field Intensity is Highest at the Poles - Page 10

Magnetic Field Intensity is Highest at the Poles - Page 11

Magnetic Field Intensity is Highest at the Poles - Page 12

Magnetic Field Intensity is Highest at the Poles - Page 13

Magnetic Field Intensity is Highest at the Poles - Page 14

Magnetic Field Intensity is Highest at the Poles - Page 15

of 15

Description

Free up your schedule!

Take 5 seconds to unlock