Question 1 :
Coulomb's law relates two charges and distance between them describing the electric force as being:
Question 2 :
The charge on a body is +1 C. Find the number of electrons in excess or deficit on the body.
Question 3 :
State whether true or false.<br/>Pure water is a good conductor of electricity.<br/>
Question 5 :
A potential difference of 5 V is applied across a conductor of length 10 cm. If drift velocity of electrons is $2.5 \times 10 ^{-4} m/s,$ then electron mobility will be
Question 6 :
Two equations are given below:<br>A) $\oint \overline {E} .d\overline {A} = \dfrac {Q}{E_{0}}$ B) $\oint \overline {B} . d\overline {A} = 0$
Question 7 :
Identify the conductors from the following: <br/>Eraser, paper, matchstick, copper wire, polythene.<br/>
Question 8 :
Assertion: Gauss's law show diversion when inverse square law is not obeyed.
Reason: Gauss's law is a consequence of conservation of charges.
Question 9 :
Complete the following statements with an appropriate word /term be filled in the blank space(s).<br/>The force of attraction or repulsion between two charges is given by ......................<br/>
Question 10 :
Three identical charges, each having a value $1.0 \times 10 ^ { - 3 } \mathrm { C }$are placed at the corners of an equilateral triangle of side 20 cm Find the potential at the center of the triangle
Question 11 :
Which of the following statements are true:A: Charge cannot exist without mass but mass can exist without charge<br/>B: Charge is invariant but mass varies with velocity<br/>C: Charge is conserved but mass alone may not be conserved
Question 13 :
A small sphere of mass $m$ and electric charge $q$, is suspended by a light thread. A second sphere carrying a charge $q_2$ is placed directly below the first sphere at a distance $'d' $ away. Then :
Question 16 :
An electron (of charge $-e$) revolves around a long wire with uniform charge density $\lambda$ in a circular path of radius $r$. Its kinetic energy is given by:
Question 17 :
Two point charges $q$ and $-2q$ are placed some distance $d$ apart. If the electric field at the location of $q$ due to $-2q$ is $E$, than at the location of $-2q$ due to $q$ is ( No external Field is present )
Question 18 :
Two point charges with charges  $3$ micro coulombs and $4$ micro coulombs are separated by $2$ cm.The value of the force between them?
Question 21 :
An electric line of force in the $xy-plane$ is given by equation $x^{2} + y^{2} = 1$. A particle with unit positive charge, initially at rest at the point $x = 1, y = 0$ in the $xy - plane$.
Question 22 :
On doubling the charge on one particle while leaving all other factors the same will:<br/>
Question 23 :
A charge "Q" and "2Q" are 0.05 meters apart and isolated. The ratio of the electrostatic force on the charge Q to the force on charge 2Q is:
Question 24 :
State whether true or false :Electric field calculated by a Gauss law is the field due to only those charges which are enclosed inside the Gaussian surface.
Question 25 :
Two point charges $2\ C$ and $-6\ C$ attract each otherwith a force of $12\ N$. A negative charge of $2\ C$ isadded to each of the above charges, now theforce between them is :
Question 26 :
A particle A has charge +q and a particle B has charge +4q. each having the same m . allowed to fall from rest through the same electric potential difference. the ratio of the speed of A to that of B will e
Question 29 : <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"><p class="wysiwyg-text-align-left">A hollow metal sphere of radius $5 cm$ is charged such that the potential on its surface is $10 volts$. The electric field at the centre of the sphere will be           </p>
Question 30 : <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"><p class="wysiwyg-text-align-left">The electric field at a point at a distance $r$ from an electric dipole is proportional to :</p>
Question 32 :
The specific charge of a proton is $\displaystyle 9.6\times { 10 }^{ 7 }C/kg$. The specific charge of an alpha particle will be:
Question 33 :
A plane area of $100\ {cm}^{2}$ is placed in uniform electric field of $100\ N/C$ such that the angle between area vector and electric field is $60^o$. The electric flux over the surface is
Question 34 :
The force between two point charges placed in a material medium of dielectric constant $\varepsilon_r$ is $F$. If the material is removed, then the force between them becomes:
Question 35 : <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"><p>Total Electric flux at a point in an electric field is</p>
Question 37 :
A positive charge $q$ is placed in a spherical cavity made in a positively charged sphere. The centers of sphere and cavity are displaced by a small distance $\vec {l}$. Force on charge $q$ is:<br>
Question 39 :
12 positive charges of magnitude q are placed on a circle of radius R in a manner that they are equallyspaced. A charge +Q is placed at the centre. If one of the charges q is removed, then the force on Q is
Question 40 :
If the number of electric lines of force emerging out of a closed surface is 1000, then the charge enclosed by the surface is
Question 41 :
The charge is negative, then the electric lines of forces are 
Question 42 :
If a body acquires electric charge temporarily under the influence of charged body, then the process is called:
Question 43 :
Assertion: Gaussian surface is considered carefully.
Reason: The point where electric field to be calculated should be within the surface.
Question 44 :
Two conducting charged spheres $X$ and $Y$ having unequal charges are connected by the wire. Which of the following is true?
Question 45 : <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"><p class="wysiwyg-text-align-left">A force ‘F’ is acting between two charges in air. If the space between them be completely filled with a medium $K=4$, the force will be :</p>
Question 46 :
<span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">Another unit for the quantity having the unit $\dfrac{C^2 }{Nm^2}$ is:
Question 48 :
The force acting between two point charges kept at a certain distance is $5$N. Now the magnitudes of charges are doubled and distance between them is halved, the force acting between them is _________ N.
Question 49 :
You are provided with a negatively charged gold leaf electroscope. State and explain what happens when an uncharged metal rod is brought near the disc of electroscope.
