Select all that apply. Which of the following would increase the conductivity of a connecting wire?
2 answers:
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(a) The magnetic flux through the coil is given by
where
N is the number of turns in the coil
B is the intensity of the Earth's magnetic field
A is the area enclosed by one coil
is the angle between the direction of B and the perpendicular to A.
Initially, the coil is perpendicular to the Earth's magnetic field, therefore
and 
, so the magnetic flux through the coil is given by:
(b) After the coil is rotated, its plane is parallel to the magnetic field. This means that
and 
, so the magnetic flux through the coil is simply zero:
(c) The variation of magnetic flux through the coil is
we can ignore the negative sign since we are interested only in the magnitude of the average emf, not in its direction.
For Faraday-Neumann-Lenz law, the average emf induced in the coil is given by
where
N is the number of turns in the coil
B is the intensity of the Earth's magnetic field
A is the area enclosed by one coil
Initially, the coil is perpendicular to the Earth's magnetic field, therefore
(b) After the coil is rotated, its plane is parallel to the magnetic field. This means that
(c) The variation of magnetic flux through the coil is
we can ignore the negative sign since we are interested only in the magnitude of the average emf, not in its direction.
For Faraday-Neumann-Lenz law, the average emf induced in the coil is given by
Answer:
a) 4.681*10^10 electrons
b) 3.67*10^12 electrons
Explanation:
The amount of electrons in a charge of 1C is:
You use the previous equality as a conversion factor.
a) The sing of the charge is not important in the calculation of the number electrons, so, you use the absolute value of the charge
In 7.50nC there are 4.61*10^18 electrons
b)
To obtain a charge of 0.580 µC in a neutral object you need to take out 3.67*10^12 electrons