1 Most materials have weak magnetic properties because _____
a their paired electrons spin in opposite directions
b their magnetic domains are aligned
c their electrons spin
d their atoms are electrically neutral
2 Which is a brittle material that is stronger than most metals and is commonly used in magnets?
a alloy
b ferrite
c nickel
d cobalt
3 Alnico is _____
a an alloy of metals with strong magnetic properties
b any material containing iron
c a brittle mixture of substances containing ferromagnetic element
d an element found in nature that behaves like a magnet
4 Which particle in an atom creates a tiny magnetic field when it spins?
a nucleus
b electron
c proton
d neutron
5 Magnetic domains are _____
a groups of atoms that act like little magnets
b atoms that have north and south poles
c groups of atoms that have paired electrons
d atoms with electrons that spin in opposite directions
and your thinking is????
none are correct. Number 2 question is technically and issue of the word "stronger". Stronger in what sense? tensile strength? Magnetic properties? ductle? Ferrite is a brittle ceramic material, as the question is written, I would go with that. It is a poorly worded question.
1 a their paired electrons spin in opposite directions
To understand why most materials have weak magnetic properties, we need to understand the behavior of electrons. Electrons are negatively charged subatomic particles that surround the nucleus of an atom. They possess a property known as "spin," which is an intrinsic angular momentum. The spin of an electron can be in two possible directions: spin-up or spin-down.
In most materials, the electrons are paired, meaning that for every electron with spin-up, there is another electron with spin-down. When paired electrons spin in opposite directions, their magnetic moments cancel each other out, resulting in weak magnetic properties for the material as a whole. This is known as diamagnetism.
2 d cobalt
Cobalt is a brittle material that is stronger than most metals. It is commonly used in the production of magnets due to its strong magnetic properties. Cobalt can retain its magnetism at high temperatures, making it suitable for various applications.
3 a an alloy of metals with strong magnetic properties
Alnico is an abbreviation for "aluminum, nickel, and cobalt." It is an alloy consisting of these metals as well as small amounts of iron and other elements. Alnico is known for its strong magnetic properties, which make it useful in the manufacturing of magnets. Due to its high temperature resistance, it is often used in industries where magnets are subjected to heat.
4 b electron
The particle in an atom that creates a tiny magnetic field when it spins is the electron. As mentioned before, electrons possess a property called "spin," which is an intrinsic angular momentum. When an electron spins, it generates a magnetic field associated with its motion. This magnetic field can interact with other magnetic fields, leading to various magnetic phenomena.
5 a groups of atoms that act like little magnets
Magnetic domains are groups of atoms that act like tiny magnets within a material. In these domains, the magnetic moments of the constituent atoms align with each other, resulting in a collective magnetic behavior. Each domain has its own north and south poles, similar to a larger magnet. The overall magnetic properties of a material depend on the alignment and arrangement of these magnetic domains.
1.b
2.d
3.b
4.a
5.c