Gauss\' Law for magnetism tells us: the net charge in any given volume. that the
ID: 1621296 • Letter: G
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Gauss' Law for magnetism tells us: the net charge in any given volume. that the line integral of a magnetic field around any closed loop must be zero the magnetic field of a current element. that magnetic monopole do not exist that charges must be moving to produce magnetic fields. The magnetic properties of materials come primarily from Particles with north poles Particles with south poles The motion of protons within nuclei Proton spin-angular momentum Electron magnetic dipole moments Magnetization is: The current density in an object. The charge density of moving charges in an object The magnetic dipole moment of an atom The magnetic dipole moment per unit volume of an object The magnetic field per unit volume of an object An electron traveling with speed v around a circle of radius r is equivalent to a current of: evr/2 ev/r ev/2 pi r 2 pi er/v A paramagnetic substance is placed in a weak magnetic field and its absolute temperature T is increased. As a result, its magnetization: Increases in proportion to T Increases in proportion to T^2 Remains the same Decreases in proportion to 1/T Decreases in proportion to 1/T^2 Of the three kinds of magnetic materials, which are used to make permanent magnets? Only diamagnetic Only paramagnetic Only ferromagnetic Only paramagnetic and ferromagnetic All three A basic postulate of Einstein's theory of relativity is: Everything is relative. Light has both wave and panicle behaviors. Moving clocks run more slowly than when they arc at rest. The laws of physics are the same for observers moving at constant speed with respect to each other. The speed of light is always faster when measured from a frame of reference that is moving in the same direction as the light.Explanation / Answer
16) a- Gauss law tells us about the charge in a given volume
17) e - Magnetic proeprties are due to atomic currents , the eletrons in the material are free and as spin around produce tinny magnets
18) d - When the material is magnetised the magnetic dipoles within are aligned
19) d - current is charge per unit time, elctron takes v/2*pi*r time around the orbit , hecne current = e/(v/2*pi*r)
= 2*pi*re/v
21) e - ferro magnetic material have a tendency to align in the magnetic dipoles them selves without any external magnetic field and are used for permenant magnets
20) d - as temperature increases the randomisation of the atomic mganets increases and the magnetisaion decreases - Curie's Law
22) d- Theory of relativity states that all physical laws hold good in any inertial frame.
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