Charge

Q. Two point charges +4q and +q are separated by distance r, where should a third point charge Q be placed that the whole system remains in equilibrium

Q.

Two identical metallic spheres, having unequal opposite charges are placed at a distance of $0.90\mathrm{m}$ apart. After bringing them in contact with each other, they are again placed at the same distance apart. Now the force of repulsion between them is $0.025\mathrm{N}$. Calculate the final charge on each of them.

Q. Define 1 Coulomb.

Q.

Two free positive charges $4q$ and $q$ are at a distance $l$ apart. What charge $Q$ is needed to achieve equilibrium for the entire system and where should it be placed from the charge $q$?

Q. Consider two point charges of equal magnitude and opposite sign separated by certain distance. The neutral point due to them

Q. The amount of charge present on a proton is

1. $+1.6\times {10}^{+19}C$
2. $+1.6\times {10}^{-19}C$
3. 1 C
4. Zero

Q.

What do ${\mathrm{q}}_1+{\mathrm{q}}_2=0$ signify in electrostatics?

Q. If the charge on an electron be $1.6\times {10}^{-19}C$, how many electrons should pass through a conductor in 1 second to constitute 1 ampere current.

1. $62.5\times {10}^{18}$
2. $6.25\times {10}^{19}$
3. $625\times {10}^{18}$
4. $6.25\times {10}^{18}$

Q. what will happen to leaves of electroscope if positively charged body is brought near a) uncharged electroscope b) positively charged electroscope C) negatively charged electroscope Explain?? in part (c) why do they first converge and then diverge??

Q. According to coulomb's law, which of the following statements is correct, for the given diagram?

1. 
   $q_1\times q_2<0$
2. 
   $q_1\times q_2>0$
3. 
   $q_1\times q_2=0$
4. $q_1,q_2>100C$

Q.

What is the function of enter key ?

Q. Which of the following is not a similarity between electrostatic and gravitational forces.

1. 
   Both can act in vacuum.
2. 
   Both obey the inverse-square law.
3. 
   Both are central forces and conservative in nature.
4. 
   Both can repel as well as attract particles.

Q. The number of electrons constituting 10C of charge is?

1. 
   $6.25\times {10}^{24}$
2. 
   
   $6.25\times {10}^{19}$
3. 
   $6.0\times {10}^{25}$
4. 
   $6.0\times {10}^{19}$

Q. If the distance between two equal point charges is doubled and their individual charges are also doubled, what would happen to the force between them ?

1. 
   Becomes double
2. 
   Becomes half
3. 
   Remains same
4. 
   Becomes four times

Q.

One coulomb charge is equivalent to the charge contained in:
(a) $2.6\times {10}^{19}$ electrons
(b) $6.2\times {10}^{19}$ electrons
(c) $2.65\times {10}^{18}$ electrons
(d) $6.25\times {10}^{18}$ electrons

Q. The force $F$ experienced by a charge $q$ in an electric field $E$ is

1. $F=2qE$
2. $F=3qE$
3. $F=qE$

Q.

If a positively charged object has an affinity to attract another body, then what charge does the other body possesses.

1. (b) and (c) above.

2. Positive

3. Negative

4. No charge

Q.

Number of electrons in a charge of $16C$ will be

1. 10²⁰

2. 10¹⁹

3. 10

4. 10¹⁸

Q.

Electrical charge is measured in the units called __.

Q.

When an ebonite rod is rubbed with cat skin, a positive charge is developed on cat skin.

1. True
2. False

Q.

What did Michael Faraday discover?

Q. Consider a conducting shell. Two point charges q1 and q2 are inside the shell and two q3 and q4 are outside the shell. Then induced charge on the outer surface of conducting shell is : (1) (q1+ q2) (2) – (q1 + q2) (3) (q3+q4) (4)–(q3+q4)

Q. When a plastic ruler is rubbed with a cloth, it becomes negatively charged and the cloth becomes positively charged by an equal amount.Which of the following principle explain this phenomena.

1. 
   Quantisation of charge
2. 
   Additivity of charge
3. 
   Conservation of charge
4. 
   None of the above.

Q.

Product of one volt and one coulomb is equal to one joule.

1. True
2. False

Q.

The number of electrons must be removed from a conductor, so that it acquires a charge of 4.8nC

Q.

Question 7
An inflated balloon was pressed against a wall after it has been rubbed with a piece of synthetic cloth. It was found that the balloon sticks to the wall. What force might be responsible for the attraction between the balloon and the wall?

Q. The unit of electrostatic constant $‘k^{\prime }$ in Coulomb’s law is

1. $\frac{{\text{kgm}}^3{\text{s}}^4}{{\text{A}}^2}$
2. $\frac{{\text{kgm}}^3}{{\text{A}}^2{\text{s}}^4}$
3. $\frac{{\text{kgm}}^2{\text{S}}^2}{{\text{A}}^2}$
4. $\frac{{\text{kgm}}^2}{{\text{A}}^2{\text{S}}^4}$

Q. What should be the position of charge q = 5μC for it to be in equilibrium on the line joining two charges q1 = – 4 μC and q2 = 16 μC separated by 9 cm. Will the position change for any other value of charge q?

Q.

Two particles A and B of masses $m$ and $2m$ have charges $q$ and $2q$, respectively. They are moving with velocities $v_1$​ and $v_2$​ , respectively, in the same direction, enters the same magnetic field, $B$ acting normally to their direction of motion. If the two forces $F_A$ and $F_B$​ acting on them are in the ratio of $1:2$, find the ratio of their velocities.

Q. A small ball has charge q is 1/7×10^-17 no. Of electrons removed from ot