A polythene piece rubbed with wool is found to have a negative charge of $3 imes10^{-7}$ C. Estimate the number of electrons transferred (from which to which?).

OR

What is 'dielectric'? Explain the influence of a dielectric on the capacitance of a capacitor.

Question

A polythene piece rubbed with wool is found to have a negative charge of $3	imes10^{-7}$ C. Estimate the number of electrons transferred (from which to which?).

OR

What is 'dielectric'? Explain the influence of a dielectric on the capacitance of a capacitor.

Accepted Answer

>

> [!TLDR]
> Charge is quantized: $n = q/e$ gives the number of electrons that moved from wool onto the polythene. (OR: a dielectric's polarization raises capacitance by its dielectric constant $K$.)
>
> Charge is quantized: $q = ne$, where $e = 1.6	imes10^{-19}$ C is the electronic charge.
>
> Given $q = 3	imes10^{-7}$ C (negative charge on polythene):
> $$n = \dfrac{q}{e} = \dfrac{3	imes10^{-7}}{1.6	imes10^{-19}} \approx 1.875	imes10^{12}$$
> …

Q.A polythene piece rubbed with wool is found to have a negative charge of $3\times10^{-7}$ C. Estimate the number of electrons transferred (from which to which?).

Q.A polythene piece rubbed with wool is found to have a negative charge of $3\times10^{-7}$ C. Estimate the number of electrons transferred (from which to which?).

Q.A polythene piece rubbed with wool is found to have a negative charge of 3×10−73\times10^{-7}3×10−7 C. Estimate the number of electrons transferred (from which to which?).

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Q.A polythene piece rubbed with wool is found to have a negative charge of 3×10−73\times10^{-7}3×10−7 C. Estimate the number of electrons transferred (from which to which?).

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Q.A polythene piece rubbed with wool is found to have a negative charge of $3\times10^{-7}$ C. Estimate the number of electrons transferred (from which to which?).

Unlock the full solution

Q.A polythene piece rubbed with wool is found to have a negative charge of $3\times10^{-7}$ C. Estimate the number of electrons transferred (from which to which?).

Unlock the full solution