Properties of Charges

Q.

What is the charge of an electron? How many electrons make a coulomb of charge?

Q. Two metal spheres of capacitance $C_1$ and $C_2$ carry some charges. They are put in contact and then separated. The final charge $Q_1$ and $Q_2$ on them will satisfy

1. $\frac{C_1}{C_2}=\frac{Q_2}{Q_1}$
2. $\frac{C_1}{C_2}>\frac{Q_1}{Q_2}$
3. $\frac{C_1}{C_2}<\frac{Q_1}{Q_2}$
4. $\frac{C_1}{C_2}=\frac{Q_1}{Q_2}$

Q.

$\frac{4}{25}$ coulomb of charge contains ________ electrons.

1. ${10}^{15}$

2. ${10}^{18}$

3. ${10}^{20}$

4. none of these

Q. An electron at rest has a charge of $1.6\times {10}^{-19}\text{C}$. It starts moving with a velocity $v=c/2$, where $c$ is the speed of light, then the new charge on it is -

Q.

If a body has a charge of magnitude $8\times {10}^{–19}$ coulomb what is the correct combination of protons and electrons on it?

1. 58 p and 53 e

2. 60 p and 64 e

3. 15 p and 12 e

4. 105 p and 112 e

Q. Which of the following electric field lines configuration is correct for an isolated positive point charge?
(Angles shown in the options are between the electric field lines and the tangent at the point of contact.)

1. 
2. 
3. 
4. 

Q.

Two electrons are kept at a separation of 10 fm (1 fm = 10^-15 m). Determine the gravitational force of interaction between these two electrons. (mass of an electron = 9.1×10^-31 kg.)

Q. A toy car with charge q moves on a frictionless horizontal plane surface under the influence of a uniform magnetic field \xrightarrow[{E }]{} . due to force q\xrightarrow[E]{} , its velocity increases from 0 to 6m/s in one second duration . At that ins†an t the direction of the field reversed . The car continues to move for two more second under the influence of this field . the average velocity and the average speed of the toy car between 0 to 3 second are respectively.

Q.

A body is having a charge of 10 C. When it comes in contact with an charged body then it loses-1.6C of charge. Find the number of electrons lost.

1. $1.6\times {10}^{-19}$

2. $1.6\times {10}^{19}$

3. ${10}^{19}$

4. $–{10}^{19}$

Q. Which of the following electric field lines configuration is correct?

1. 
2. 
3. 
4. 

Q. Which of the following electric field lines configuration is correct for an isolated positive point charge?
(Angles shown in the options are between the electric field lines and the tangent at the point of contact.)

1. 
2. 
3. 
4. 

Q.

How many electrons are there in 1 coulomb of charge?

Q. A conductor has $14.4\times {10}^{-19}$ coulombs positive charge. The conductor has (Charge on electron $1.6\times 10-19$coulombs )

1. 9 electrons in excess
2. 27 electrons in short
3. 27 electrons in excess
4. 9 electrons in short

Q.

If a body has a charge of magnitude $8\times {10}^{–19}$ coulomb what is the correct combination of protons and electrons on it?

1. 58 p and 53 e

2. 60 p and 64 e

3. 15 p and 12 e

4. 105 p and 112 e

Q. The charge of an electron is $1.6e-19$ C. Then which of the following charges exist?

1. $9.6e-19$
2. $3e-19$
3. $3.2e-19$
4. $4.8e-19$
5. $2e-19$
6. $8e-19$
7. $16e-19$
8. $8e-19$