Question 880: Electrostats & Capacitance

Question

When a piece of polythene is rubbed with wool, a negative charge of $$4 	imes 10^{-7} \mathrm{C}$$ is developed on the polythene. The number of electrons transferred from wool to polythene is $$[e=1.6 	imes\left.10^{-19} \mathrm{C}ight]$$

Accepted Answer

$$q = 4 	imes {10^{ - 7}}$$
$$q = Ne$$
$$N = {q \over e} = {{4 	imes {{10}^{ - 7}}} \over {1.6 	imes {{10}^{ - 19}}}} = 2.5 	imes {10^{12}}$$

Answer

$$1.5 	imes 10^{12}$$

Answer

$$3.5 	imes 10^{13}$$

Answer

$$2.5 	imes 10^{13}$$

Answer

$$2.5 	imes 10^{12}$$

Electrostats & Capacitance

When a piece of polythene is rubbed with wool, a negative charge of $4 \times 10^{-7} \mathrm{C} is developed on the polythene. The number of electrons transferred from wool to polythene is [e=1.6 \times\left.10^{-19} \mathrm{C}\right]

Choose the correct answer: