Question 1 :
The kinetic energy of an electron, which is accelerated in the potential difference of $100\ V$, is
Question 3 : The potential energy of a proton is $3.2\times 10^{-18}J$ at a particular point. The electric potential at this point is:<div>(Given charge on a proton is $1.6 \times 10^{-19}\ C$)</div>
Question 4 :
The work done is carrying a charge q once round a circle of radius r with a charge q at the center is?
Question 5 :
The electric potential (in volt) a region given by<br>$V = 6 x - 8 x y ^ { 2 } - 8 y + 6 y z - 4 x ^ { 2 }$ Then electric force acting on a point charge of 2c placed at the origin will be
Question 6 :
If $4 \times 10^{20}eV$ is required to move a charge of $0.25\ C$ between two points, the potential difference between these two points is:
Question 7 :
In a CRO the acceleration of electrons is controlled by changing .................. between the cathode and anode.<br>
Question 10 :
The electron drift speed is small and the charge of the electron is also small but still, we obtain large current in a conductor. This is due to
Question 11 :
Number of electrons that consitute one ampere of current is :
Question 12 :
 Calculate the work done to move to $10\ \mu c$ charge from a point at a potential of $10$ V to a point which is at a potential of $90$ V is:
Question 13 :
Write true or false for the following statements :<br>Positive charge flow from high potential to low potential.
Question 14 :
Two capacitors of caacity ${ C }_{ 1 }$ and ${ C }_{ 2}$ are connected in series and potential difference V is applied across it. Then the potential difference across${ C }_{ 1 }$ will be
Question 15 :
A cylindrical capacitor has two co-axial cylinders of length 20 cm and radii 2r and r.Inner cylinder is given a charge 10 $\mu C$ and outer cylinder a charge of -10 $\mu C$.The potential difference between the two cylinders will be.
Question 16 :
When a 2$\mu$C charge is carried from point A to point B, the amount of work done by the electric field is 50 $\mu$J. What is the potential difference and which point is at a higher potential?
Question 17 :
For $20\ \Omega$ resistance are connected in series and the combination is connected to a $20\ V$ emf. The potential difference across any one of the resistors is
Question 18 :
Assertion : The electric bulb glows immediately when switch is on.<br/>Reason : The drift velocity of electrons in a metallic wire is very high.<br/>
Question 19 :
Two points $P$ and $Q$ are maintained at the potential of $10\ V$ and $-4V$ respectively. The work done in moving $100$ electrons from $P$ to $Q$ is:
Question 20 :
The amount of $2 A$ electric current is passed for 1 minute through one conducting wire. How much total electric charge will pass through this wire ?
Question 21 :
A 60 watt bulb carries a current of 0 .5 amp. Th total charge passing through it in 1 hour is
Question 22 :
A metallic resistor is connected across a battery. If the number of collisions of the free electrons with the lattice is somehow decreased in the resistor (for example, by cooling it), the current will
Question 23 :
A metal wire is subjected to a constant potential difference. When the temperature of the metal wire increases, the drift velocity of the electron in it
Question 25 :
Two horizontal metal plates having a potential difference of $800\mathrm { V }$ are $0.02\mathrm { m }$ apart. A particle of mass $1.92 \times 10 ^ { - 15 } \mathrm { kg }$ is suspended in equilibrium between the plates. Ife is the elementry charge, then charge on the particle is:
Question 27 :
A parallel plate condenser has conducting plates of radius $12cm$ seperated by a distance of $5mm$. It is charged with a constant charging current of $0.16A$. the rate at which the potential difference between the plates change is:
Question 28 :
A point-charge of $6.0\times 10^{-8}$ C is situated at the coordinate origin. How much work will be done in taking an electron from the point $x=3$m to $x=6$m?
Question 29 :
Heat flows radially outward through a spherical shell of outside radius $R_{2}$ and inner radius $R_{1}$. The temperature of inner surface is $\Theta _{1}$ and that outer is $\Theta _{2}$. At what radial distance fro m center of shell the temperature is just half way between $\Theta _{1}$ and $\Theta _{2}$
Question 30 :
Assertion: STATEMENT-1 : The current density $\vec{J}$ at any point in ohmic resistor is in direction of electric field $\vec{E}$ at that point.
Reason: STATEMENT-2 : A point charge when released from rest in a region having only electrostatic field always moves along electric lines of force.
Question 31 :
The current density across a cylindrical conductor of radius $R$ varies according to the equation $J = J_0\left(1-\displaystyle\frac{r}{R}\right)$, where $r$ is the distance from the axis. Thus the current density is a maximum $J_0$ at the axis $r=0$ and decreases linearly to zero at the surface $r=R$. Calculate the current in terms of $J_0$ and the conductors cross sectional area is $A = \pi R^2$.<br>
Question 32 :
When a photon of light collides with a metal surface, possible number of electrons coming out is?
Question 33 :
Two particles X and Y having equal charges, after being accelerated through the same potential difference , enter a region of uniform magnetic field and describe circular paths of radii $R_1$ and$R_2$ respectively. The ratio of the mass of X to the Y is
Question 34 :
Two points P and Q are maintained at potentials of of $10V$ and $-4V$ respectively. The work done in moving $100$ electrons from P to Q is proportional to
Question 35 :
The displacement of charge $q$ in the electric field $\vec E = e_1\hat i + e_2 \hat j + e_3 \hat j$ is$\vec r = a \hat i + b \hat j$. The work done is
Question 36 :
Find the current produced when $20,000$ alpha-particles per second are passing through a straight tube of certain radius.
Question 38 :
<span>How much work would be required to move a proton from the negative to the positive plate?</span>
Question 39 :
Given that $E = ((3x^2<br><br> + y) \hat i + x \hat y) kV/m$, find the work done in moving a $- 2 \mu C$ charge from $(0, 5, 0)$ to $(2, -1 , 0)$ by taking the path :<br>$y=5-3x$
Question 40 :
A potential difference of $2.5$V is applied across the faces of a germanium crystal plate. The face area of the crystal is $1$ $cm^2$ and its thickness is $1.0$ mm. The free electron concentration in germanium is $2\times 10^{19} m^{-3}$ and the electron and holes mobilities are $0.33 m^2/V$ and $0.17m^2/V$ respectively. The current across the plate will be?
Question 41 :
A number of condensers, each of capacitance $1\mu F$ and each one of which gets punctured if a potential difference just exceeding $500\ V$ is applied, are provided. An arrangement suitable for giving capacitance of $2\mu F$ across which $3000$ volt may be applied requires at least.
Question 42 :
A charge of $10$ C is brought from infinity to a point near a charged body and in this process, $200$ J of work is done.  Calculate the electric potential at that point near the charged body
Question 43 :
A 1-meter length 22 gauge of copper wire has a current of 1 mA passing through it $1.7\times10^8m$<span class="MathJax"><span class="MJX_Assistive_MathML">=1.7108m</span></span> in this wire.
Question 44 :
A charge is moved from a point A to point B. The work done to move unit charge during this process is called.<br>
