Unit of Charge

Q. two positive charges of 1 microcoulomb and 2 microcouomb are placed are placed 1 m apart. The value of electric field in N/C at the mid point of the charges will be

Q. A body has – 80 micro coulomb of charge. Number of additional electrons in it will be

1. $8\times {10}^{-5}$
   
2. $80\times {10}^{-17}$
   
3. $5\times {10}^{14}$
   
4. $1.28\times {10}^{-17}$

Q.

(a) Explain the meaning of the statement ‘electric charge of a body is quantised’.

(b) Why can one ignore quantisation of electric charge when dealing with macroscopic i.e., large scale charges?

Q.

The flux entering and leaving a closed surface are 5×10^5 and 4×10^5 in si unit the charge inside the surface is

-8.85×10^-7 c

8.85×10^-7

8.85×10^-7

-6.85×10^7

6.85×10^-7

Q. When ${10}^{14}$ electrons are removed from a neutral metal sphere, the charge on the sphere becomes

1. $16\mu C$
2. $-16\mu C$
3. $32\mu C$
4. $-32\mu C$

Q.

Dimensional formula for product of charge per unit volume and voltage

Q.

If a body contains $n_1$ electrons and $n_2$ protons, the total amount of charge on the body is___________

Q. The number of electrons in 1.6 C charge will be

1. ${10}^{19}$
   
2. ${10}^{20}$
   
3. $1.1\times {10}^{19}$
   
4. $1.1\times {10}^2$

Q. When ${10}^{19}$ electrons are removed from a neutral metal plate, the electric charge on it is

1. -16 C
2. +16 C
3. 10' C
4. 10' C

Q. Number of electrons in one coulomb of charge will be

1. $5.46\times {10}^{29}$
2. $6.25\times {10}^{18}$
3. $1.6\times {10}^{+19}$
4. $9\times {10}^{11}$

Q.

How many electrons are in a Coulomb?

Q.

We have two types of charges-positive and negative. Is the positive charge stronger than the negative charge? explain your answer.

Q. Charge on $\alpha$- particle is

1. $4.8\times {10}^{-19}C$
   
2. $1.6\times {10}^{-19}C$
   
3. $3.2\times {10}^{-19}C$
   
4. $6.4\times {10}^{-19}C$

Q.

What kind of charge is acquired by a body when it loses an electron?

Q. Electric charge Q Q -2Q respectively are placed at three corners of an equilateral triangle of side a . Magnitude of the electric dipole moment of the system is

Q. no. of electrons constituting 10C of charge

Q. The number of electrons in 1.6 C charge will be

1. ${10}^{19}$
   
2. ${10}^{20}$
   
3. $1.1\times {10}^{19}$
   
4. $1.1\times {10}^2$

Q. The magnetic field is perpendicularly into the plane of the paper and a few charged particles are projected in it. Which of the following statement is true?

1. A represents proton and B and electron
2. Both A and B represent protons but velocity of A is more than that of B
3. Both A and B represents protons but velocity of B is more than that of A
4. Both A and B represent electrons, but velocity of B is more than that of A

Q. A dielectric slab is inserted between the plates of a capacitor. The charge on the capacitor is $Q$ and the magnitude of the induced charge on each surface of the dielectric is $Q^{\prime }$.

Q. Which one of the following is not the unit of electric charge?

1. $joule/volt$
2. $ampere-second$
3. $\frac{newton}{m/s-tesla}$
4. $volt/joule$

Q. Four point charges as , + 4 microcoulomb, + 2 microcoulomb , - 4 microcoulomb and - 2 microcoulomb are respectively placed at the corners A , B, C and D of a square of side length 10 cm . What is the electric field intensity at the centre of the square ?

Q. Number of electrons in one coulomb of charge will be

1. $5.46\times {10}^{29}$
2. $6.25\times {10}^{18}$
3. $1.6\times {10}^{+19}$
4. $9\times {10}^{11}$

Q. A capacitor of capacitance C is charged by connecting it to a battery of e.m.f. E volts. The capacitor is now disconnected and reconnected to the same battery with polarity reversed. The heat energy developed in the connecting wire is:

1. $C{E}^2$
2. Zero.
3. $\frac{1}{2}C{E}^2$
4. $2C{E}^2$

Q. Number of electrons in one coulomb of charge will be

1. $5.46\times {10}^{29}$
2. $6.25\times {10}^{18}$
3. $1.6\times {10}^{+19}$
4. $9\times {10}^{11}$

Q. Electric charges having same magnitude ofcharge q coulombs are placed at x 14 m, 8so on. If any two consecucharges have opposite sign but the first charnecessarily positive, what will be the potental ae of em, 2(1) Infinity(2) Zero1 1244πε 0(4)

Q. A point charge is brought in an electric field. The electric field at a nearly point :

1. may increase if the charge is positive
2. will increase if the charge is positive
3. will decrease if the charge is negative
4. may decrease if the charge is negative

Q. A body has – 80 micro coulomb of charge. Number of additional electrons in it will be

1. $8\times {10}^{-5}$
   
2. $80\times {10}^{-17}$
   
3. $5\times {10}^{14}$
   
4. $1.28\times {10}^{-17}$

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

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

Q.

What is the Unit of Charge?

1. Ohm

2. Coulomb

3. Volt

4. Ampere

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