Question

In: Physics

1. Determine the quantity of charge on the following questions. Use 1.60 x 10-19 C for...

1. Determine the quantity of charge on the following questions. Use 1.60 x 10-19 C for the charge of an electron. [3 marks]

a. a plastic tube which has been rubbed with animal fur and gained 3.8x109 electrons.

b. a vinyl balloon which has been rubbed with animal fur and gained 1.7x1012 electrons.

c. an acetate strip which has been rubbed with wool and lost 7.3x108 electrons.

Expert Solution

(1)(a) number of electrons gained by plastic tube

$\mathfb{n=3.8\times 10^{9}}$

Quantity of charge-

$\mathfb{q=ne}$

$\mathfb{\Rightarrow q=3.8\times 10^9 \times 1.6\times 10^{-19}C}$

$\mathfb{\Rightarrow q=6.08 \times 10^{-10}C}$

Since plastic tube gains electrons which are negativity charge so nature of vharge on tune will be also negative it means-

$\mathfb{\Rightarrow q=-6.08 \times 10^{-10}C}$

------------------------------------------------------------

(b) $\mathfb{n=1.7\times 10^{12}}$

Quantity of charge on the balloon-

$\mathfb{q=ne}$

$\mathfb{q=1.7\times 10^{12}\times 1.6 \times 10^{-19}}$

$\mathfb{\Rightarrow q=2.72 \times 10^{-7}C}$

Since balloon gained the electrons so it becomes negatively charged i.e.-

$\mathfb{q=-2.72 \times 10^{-7}C}$

-----------------------------------------------------------

(C) $\mathfb{n=7.3 \times 10^8}$

$\mathfb{q=ne}$

$\mathfb{\Rightarrow q=7.3\times 10^8\times 1.6 \times 10^{-19}}$

$\mathfb{\Rightarrow q=1.168 \times 10^{-10}C}$

since the strip lost the electrons so it becomes positively charged i.e.-

$\mathfb{q=+1.168 \times 10^{-10}C}$

genius_generous answered 10 hours ago

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