A polythene piece rubbed with wool is found to have negative charge of 3.6 × 10-7 C. If an electron has a mass 9.1 × 10-31 kg, find the mass transferred to polythene.

Question

A polythene piece rubbed with wool is found to have negative charge of 3.6 × 10-7 C. If an electron has a mass 9.1 × 10-31 kg, find the mass transferred to polythene. (A) 2.25 × 1010 kg (B) 6.25 × 10-18 kg (C) 2.05 × 10-18 kg (D) 4.15 × 10-18 kg

Tardigrade Admin · Accepted Answer

n=(q/e)=(3.6 × 10-7 C /1.6 × 10-19 C )=2.25 × 1012 Therefore, mass transferred from wool to polythene, M=n × me =2.25 × 1012 × 9.1 × 10-31 =2.05 × 10-18 kg

Q. A polythene piece rubbed with wool is found to have negative charge of $3.6 \times 1 0^{- 7} C$ . If an electron has a mass $9.1 \times 1 0^{- 31} k g$ , find the mass transferred to polythene.

$2.25 \times 1 0^{10} k g$

$6.25 \times 1 0^{- 18} k g$

$2.05 \times 1 0^{- 18} k g$

$4.15 \times 1 0^{- 18} k g$

$n = \frac{q}{e} = \frac{3.6 \times 1 0 ^{- 7} C}{1.6 \times 1 0 ^{- 19} C} = 2.25 \times 1 0^{12}$
Therefore, mass transferred from wool to polythene,
$M = n \times m_{e} = 2.25 \times 1 0^{12} \times 9.1 \times 1 0^{- 31}$
$= 2.05 \times 1 0^{- 18} k g$

Q. A polythene piece rubbed with wool is found to have negative charge of 3.6×10−7C. If an electron has a mass 9.1×10−31kg, find the mass transferred to polythene.

2.25×1010kg

6.25×10−18kg

2.05×10−18kg

4.15×10−18kg