"4.What determines how many figures are significant in reported measurement values? What
1 answer:
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Answer:
Explanation:
According to Gausses theorem, electric flux coming out of charge on all sides q is equal to
q / ε₀
q is charge , ε₀ is permittivity of air whose value is given by
8.85 x 10⁻¹²; q = 21.2 x 10⁻⁹ C
Putting the values we get
FLUX =
2.4 x 10³ Nm²/C
(A) We can solve the problem by using Ohm's law, which states:
where
V is the potential difference across the electrical device
I is the current through the device
R is its resistance
For the heater coil in the problem, we know
and 
, therefore we can rearrange Ohm's law to find the current through the device:
(B) The resistance of a conductive wire depends on three factors. In fact, it is given by:
where
is the resistivity of the material of the wire
L is the length of the wire
A is the cross-sectional area of the wire
Basically, we see that the longer the wire, the larger its resistance; and the larger the section of the wire, the smaller its resistance.
where
V is the potential difference across the electrical device
I is the current through the device
R is its resistance
For the heater coil in the problem, we know
(B) The resistance of a conductive wire depends on three factors. In fact, it is given by:
where
L is the length of the wire
A is the cross-sectional area of the wire
Basically, we see that the longer the wire, the larger its resistance; and the larger the section of the wire, the smaller its resistance.
Explanation:
Particle moving in a circular path with a constant speed.
