Name: Continuous Charge Distribution
Uploaded: 2019-07-19
Duration: 5 min 39 s
Description: This video will help us understand the necessity of continuous charge distribution and learn about the concept of linear charge density. Learn more.

Question

(a) How many electrons are there in $1 C$ of negative charge?

(b) Which is the true test of electrification: attraction or repulsion?

(c) Can a body have a charge of $0 .8 \times 10^{- 19} C$ ?

Accepted Answer

Charge is defined as the physical property of matter that causes it to experience a force when placed in an electromagnetic field. Its S.I. unit is coulomb.

The charge of electron is related its number as,

$q = n e$ , where $n$ is an integer and $e$ is charge on one electron.

$\Rightarrow n = \frac{q}{e} = \frac{1}{1.6 \times 10^{- 19}} = 6.25 \times 10^{18}$

These are the number of electrons in $1 C$ of charge.

Repulsion: It is a type of force which occurs between two particles having the same charge. This means that the bodies are first required to be charged of same nature for the repulsive force.

Attraction: While attraction can even occur in two uncharged bodies, hence, there is no need for the bodies to acquire charges. For example, the gravitational force is an attractive force that can occur in any two bodies which have masses.

Hence, repulsion is the true test of electrification.

As charge is a quantized property, so it exists in the integral multiples of $1.6 \times 10^{- 19} C$ ,

i.e., $q = n e$

$n$ is the number of electrons,

$e$ is the charge of an electron.

Plugging the values, we get,

$0.8 \times 10^{- 19} = n \times 1.6 \times 10^{- 19} \Rightarrow n = \frac{0.8 \times 10^{- 19}}{1.6 \times 10^{- 19}} = \frac{1}{2}$

As $n$ is not an integer, hence, a body can never have a charge of $0.8 \times 10^{- 19} C$ .

(a) How many electrons are there in $1 C$ of negative charge?

(b) Which is the true test of electrification: attraction or repulsion?

(c) Can a body have a charge of $0 .8 \times 10^{- 19} C$ ?

Important Questions on Coulomb's Law and Electric Field

Learn and Prepare for any exam you want !

(a) How many electrons are there in 1 C of negative charge? (b) Which is the true test of electrification: attraction or repulsion? (c) Can a body have a charge of 0.8×10-19 C?

Important Questions on Coulomb's Law and Electric Field

Learn and Prepare for any exam you want !

(a) How many electrons are there in $1 C$ of negative charge?

(b) Which is the true test of electrification: attraction or repulsion?

(c) Can a body have a charge of $0 .8 \times 10^{- 19} C$ ?