Properties of Charges

Q.

The velocity of photon is proportional to (where v is frequency)

1. $\frac{v^2}{2}$
2. $\frac{1}{\sqrt{v}}$
3. $\sqrt{v}$
4. $v$

Q.

What is the ratio of electrostatic force and gravitational force between a proton and electron at 1mm distance?

Mass of proton – $1.67\times {10}^{-27}$ kg

Mass of electron – $9.11\times {10}^{-31}$ kg

Charge of electron – $1.6\times {10}^{-19}$ kg

1. ${10}^{38}$

2. ${10}^{39}$

3. ${10}^{40}$

4. ${10}^{41}$

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. $8e-19$

Q.

If a body has a charge of magnitude 8 × 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. An isolated solid metallic sphere of radius $R$ is given an electric charge. Which of the graphs below correctly shows the way in which the electric field $E$ varies with distance $x$ from the centre of the sphere?

1. 
2. 
3. 
4. 

Q. A point charge $-q$ of mass $m$ is released with negligible speed from a distance $\sqrt{3}R$ on the axis of a fixed uniformly charged ring of charge $Q$ and radius $R$. Find out the velocity of point charge when it reaches the centre of ring.

1. $\sqrt{\frac{KQq}{2mR}}$

2. $\sqrt{\frac{KQq}{mR}}$

3. $\sqrt{\frac{2KQq}{mR}}$

4. $\sqrt{\frac{KQq}{3mR}}$

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.

As a cat rubs its back along a carpet, it acquires a charge of $+8.2\times {10}^{-7}C$. How many electrons did it lose to the carpet?

1. $5.12\times {10}^{19}$

2. $5.12\times {10}^{12}$

3. $51.2\times {10}^{12}$

4. cannot be determined

Q. Two identical rings $P$ and $Q$ of radius $0.1\text{m}$ are mounted coaxially at a distance $0.5\text{m}$ apart. The charges on the two rings are $2\mu C$ and $4\mu C$ respectively. The work done in transferring a charge of $5\mu C$ from the centre of $P$ to that of $Q$ is

1. $0.72\text{J}$
2. $2.24\text{J}$
3. $0.144\text{J}$
4. $1.28\text{J}$

Q.

If a negatively charged body comes in contact with a neutral body and 10 electrons flow towards the neutral body then find the charge acquired by the neutral body.

1. $16\times {10}^{-19}coulombs$

2. $-16\times {10}^{-19}coulombs$

3. $-1.6\times {10}^{-19}coulombs$

4. $-1.6\times {10}^{-19}coulombs$

Q. Which of the following electric field configurations describes the lines of force in an electric field between two parallel plates of opposite charge?

1. 
2. 
3. 
4. 

Q.

As a cat rubs its back along a carpet, it acquires a charge of $+8.2\times {10}^{-7}C$. How many electrons did it lose to the carpet?

1. $5.12\times {10}^{19}$

2. $5.12\times {10}^{12}$

3. $51.2\times {10}^{12}$

4. cannot be determined

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

1. 
2. 
3. 
4.