A 0.12 g honeybee acquires a charge of +24pC while flying. The earth's electric field near the surface is typically 100 N/C, downward. (a) How many electrons were added to or removed from the honeybee? (b) What is the ratio of the electric force on the bee to the bee’s weight (Fe/Fg)? (c) What electric field strength and direction would allow the bee to hang suspended in the air without effort?

Respuesta :

Answer:

150000000

[tex]\dfrac{F_e}{F_g}=0.00000203873598369[/tex]

49050000 N/C

Explanation:

q = Charge = 24 pC

m = Mass of honeybee = 0.12 g

E = Electric field = 100 N/C

g = Acceleration due to gravity = 9.81 m/s²

[tex]1\ C=6.25\times 10^{18}\ electrons[/tex]

Number electrons is

[tex]n=24\times 10^{-12}\times 6.25\times 10^{18}\\\Rightarrow n=150000000[/tex]

The number of electrons added or removed was 150000000

Force is given by

[tex]F_e=Eq\\\Rightarrow F_e=100\times 24\times 10^{-12}\\\Rightarrow F_e=2.4\times 10^{-9}\ N[/tex]

The ratio is

[tex]\dfrac{F_e}{F_g}=\dfrac{2.4\times 10^{-9}}{0.12\times 10^{-3}\times 9.81}\\\Rightarrow \dfrac{F_e}{F_g}=0.00000203873598369[/tex]

The ratio is [tex]\dfrac{F_e}{F_g}=0.00000203873598369[/tex]

Balancing the forces we get

[tex]Eq=mg\\\Rightarrow E=\dfrac{mg}{q}\\\Rightarrow E=\dfrac{0.12\times 10^{-3}\times 9.81}{24\times 10^{-12}}\\\Rightarrow E=49050000\ N/C[/tex]

The electric field required is 49050000 N/C

The ratio of the electric force on the bee to the bee’s weight (Fe/Fg) is; 2.041 * 10⁻⁶

The electric field strength is; 4.9 * 10⁷ N/C

What is the electric field strength?

We are given;

Mass of bee; m = 0.12g = 0.00012 kg

Charge acquired by the bee q = +24 pC = 24 * 10⁻¹² C

Electric field; E = 100 N/C

B)  The force F on a charge in electric field E is given by:

F = qE

F = 24 * 10⁻¹² * 100

F = 24 * 10⁻¹⁰ N

Weight is;

F_g = mg

F_g = 0.00012 * 9.8

F_g = 11.76 × 10⁻⁴ N

Ratio of force to weight is;

F_e/F_g = (24 * 10⁻¹⁰)/(11.76 × 10⁻⁴)

F_e/F_g = 2.041 * 10⁻⁶

C) To get the electric field strength, we will use the formula;

E' = mg/q

E' = (0.00012 * 9.8)/(24 * 10⁻¹²)

E' = 4.9 * 10⁷ N/C

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